Factual error: Without getting into the physics of the whole thing, there is no way a shotgun, and especially a shotgun with the kind of shells they were using, could knock a full grown man down like that. At worst he would be bruised from the re-coil, or the weapon would fly out of his hand, depending on how he was holding it at the time he fired.

Wedding Crashers (2005)
1 factual error - chronological order
Directed by: David Dobkin
Starring: Owen Wilson, Christopher Walken, Vince Vaughn, Rachel McAdams, Isla Fisher
Continuity mistake: During the football game where Jeremy and Sack "tackle" for the second time, Gloria and Mrs. Cleary are startled and jump up from their seats. In one shot Mrs. Cleary's glass is filled about half way with a redish liquor, but in the next it is a hardly visible clear liquid.
Jeremy Grey: A friend in need is a pest.
Trivia: John Beckwith's line, "I think we only use 10 per cent of our hearts", was ad-libbed by Owen Wilson.
Question: What was the "substance" in the eye drops that was dispatched into the water?
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Chosen answer: The substance is Visine Eye drops which is an old bartender trick for obnoxious drunks. Just a couple of drops in a drink will indeed make the person feel ill.
Damian Torres