Check for Provide an accessible overview (MOS:INTRO): Done
Major Point 1: Plot "focuses on a relationship between New York salesgirl Sadie Hermann (played by Dorothy Mackaill) and Irish subway guard Herb McCarthy (played by Jack Mulhall)." (not a concise summary of the Plot section)
Major Point 2: Production "Subway Sadie is a 1926 … the black-and-white film" & "The cast, … and distributed by First National Pictures" (summarised well in the lead)
Major Point 3: Release and reception "the film had its premiere in New York … unclear if a print of Subway Sadie has survived." (not a concise summary of the Release and reception section)
Check for Relative emphasis: Done
Major Point 1: Plot "focuses on a relationship between New York salesgirl Sadie Hermann (played by Dorothy Mackaill) and Irish subway guard Herb McCarthy (played by Jack Mulhall)." (the lead does not give due weight as is given in the body)
Major Point 2: Production "Subway Sadie is a 1926 … the black-and-white film" & "The cast, … and distributed by First National Pictures" (the lead gives due weight as is given in the body)
Major Point 3: Release and reception "the film had its premiere in New York … unclear if a print of Subway Sadie has survived." (the lead does not give due weight as is given in the body)
"practically an entire day" in order to observe them.[6]
"every girl in America." She believed that "there is not a situation in this picture which could not happen to any girl. That is one of the things I like about it. There is nothing in it that could not be true."[7]
"one of the cleverest and most interesting pictures that has been here this season".[14]
"splendid" and the film was "a true and human story".[15]
"a nice little feature, nothing big, but will go over on bargain nights" … .[16]
"sheer brilliance rarely has been equalled" … .[17]
"delight the majority of straphangers" … "it is what the boys call excellent box-office". … "a light but charming comedy". … "a consistently decent affair" … .[18] (Random check on source 18, successful, "A picture that will delight the majority of straphangers, and that is covering a pretty large territory. It is what the boys call excellent box-office. – Morning Telegraph")
"pretty trite stuff".[19]
"a stellar combination."[20]
"very successful".[21]
Check for Likely to be challenged: Done
Check for Contentious material about living persons (WP:BLP): NA
Image 1 (Subway Sadie poster.jpg): This image is of a poster, and the copyright for it is most likely owned by either the publisher or the creator of the work depicted. It is believed that the use of scaled-down, low-resolution images of posters (1) to provide critical commentary on the film, event, etc. in question or of the poster itself, not solely for illustration and (2) on the English-language Wikipedia, hosted on servers in the United States by the non-profit Wikimedia Foundation, qualifies as fair use under United States copyright law. Other use of this image, on Wikipedia or elsewhere, might be copyright infringement.
Image 2 (Dorothy MacKaill Stars of the Photoplay.jpg): This work is in the public domain because it was published in the United States between 1923 and 1963 and although there may or may not have been a copyright notice, the copyright was not renewed. Unless its author has been dead for the required period, it is copyrighted in the countries or areas that do not apply the rule of the shorter term for US works, such as Canada (50 pma), Mainland China (50 pma, not Hong Kong or Macao), Germany (70 pma), Mexico (100 pma), Switzerland (70 pma), and other countries with individual treaties.
Image 3 (Jack Mulhall - Jul 1920 MP.jpg): This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1923. See this page for further explanation.
Image 4 (Subway Sadie promo still.png): This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1923. See this page for further explanation.
Purpose of use in article (WP:NFCC#8): Main infobox. The image is used for identification in the context of critical commentary of the work, product or service for which it serves as poster art. It makes a significant contribution to the user's understanding of the article, which could not practically be conveyed by words alone.The image is placed in the infobox at the top of the article discussing the work, to show the primary visual image associated with the work, and to help the user quickly identify the work product or service and know they have found what they are looking for.Use for this purpose does not compete with the purposes of the original artwork, namely the creator providing graphic design services, and in turn the marketing of the promoted item.
Replaceable? (WP:NFCC#1): As film poster art, the image is not replaceable by free content; any other image that shows the same artwork or poster would also be copyrighted, and any version that is not true to the original would be inadequate for identification or commentary. (Since it's copyrighted, there are no free alternatives available.)
Minimal use (WP:NFCC#3): Low resolution: The copy is of sufficient resolution for commentary and identification but lower resolution than the original poster. Copies made from it will be of inferior quality, unsuitable as counterfeit artwork, pirate versions or for uses that would compete with the commercial purpose of the original artwork.