I very quickly skimmed through my collection and found these references
The Overnight 2015 – Various references to one guy being big, and one guy being small.
Sex Nature Women Food 2012 – The guy refers to himself as having a “tiny little flaccid penis”
Republic of Doyle S03E02 – The guy tries to defend himself by saying its “colder in here than it looks”
Vice Academy Part 2 1990 (Know its Scott Layne but not 100 percent on movie title) – Girl rips guys towel off in the locker room in front of the other guys and her and her girlfriend start laughing at him commenting “Big nightstick?! More like a cocktail weenie!”
Bending all the Rules 2002 – Don’t remember exact quote but at least one reference is made to the non-Bradley Cooper guy being very large.
The Duff 2015 – Girl barges into the boys locker room and comments to one guy that “it looks like a penis, only smaller”…..isn’t that the exact same comment made in the homoerotic movie The Covenant?
El Barco – This foreign series makes a few references to the religious kid being rather large.
The Boondock Saints 1999 – In a deleted scene the boys ask their mother which one came out first during birth she states “the one with the biggest cock” and as the boys are naked at the moment the Norman Reedus character looks down between them and gets a big goofy grin, but the other defends himself by claiming he “had ice on his”.
Friends and Lovers 1999 - One of the guys pulls his towel off to show a large one, and several comments are made by both guys and girls.
Paper Towns 2015 – A girl takes revenge on a guy (I think by snatching his clothes or something, haven’t watched it) and her and her guy friend snap a picture of him running around and she says something like “It’s like Rhode Island, it may have an illustrious history but it sure isn’t big”
Heart of America 2002 – A group of guys are bullying (or inducting, again haven’t actually watched it) another group and want to see if they have “balls” so they depants them and all break out laughing stating “you’re obviously not showers”
I am soldier 2014 – A guy gets stripped in front of a woman who laughs and states “I was right you’re no man….I’ve seen mushrooms with more shaft than that”
Pretty Ugly People 2008 – Jack Noseworthy’s character is shyly hiding himself before skinny dipping trying to fluff himself up when his friend pull his hands away and states “he’s just a baby”.
Bad Education (show) – Throughout the course of the show several references are made to Jack Whitehall’s character being rather large, the slutty girl refers to him as a “tripod”.
DisOrientation (2012) – A guy is standing on podium welcoming new college students when another guy pulls down his shorts and results in the crowd laughing while the bully comments “behold where the male penis SHOULD be”
The Inbetweeners Movie 2011 – A kid pulls down a guy’s swimsuit by the pool and yells out “So little, so little!”
Newcastle 2008 – After swimming in the ocean one guy accuses another of having gotten a boner, to prove him wrong he whips down his trucks and states “It’s just big…..but you wouldn’t know anything about that would you?”
Nowhere to Run 1993 – The young kids catch Jean-Claude Van Damme bathing in a creek and the daughter later tells her mother over dinner that he had a “big penis” to which her mother corrects her that it’s an average penis (having caught him in the shower).
Sirens (show, don’t know which exact episode) – The guys (and later gals) catch a guy naked in his house and make frequent references to his large member “he’s covering it with both hands, and I can still see it”.
4.3.2.1. 2010 – A girl takes revenge on a guy that tricked her into sex, and later took pictures of her, buy tying him and his friend up and pulling down his pants and snapping pictures of him, commenting “oh, is that all you’ve got….no wonder it was over so quickly”
The Sopranos – (not sure which episode) - Michael Imperioli is forced to strip in front of rival mobsters who one of which comments “I guess you could call that a dick”
The ones in bold are ones that actually show frontal along with a reference, of course The Overnight are both prosthetic.