5. Wagons East!
Wagons East! is remembered largely for being the last film starring John Candy, who sadly died of a massive heart attack during production. The big-wigs in charge swore blind that Candy had finished his commitments before passing away, but watching the final product, it's clear that this is not the case at all. Not even the best editor in the world would be able to disguise the lack of Candy footage seemingly available here; so many scenes feature the actor awkwardly reacting out of context to something that's happening, or just standing around for no reason at all. At one point, Candy disappears from the film with no explanation given, and then when he returns, the filmmakers opted to use naff digital technology to superimpose earlier shots of the actor in new settings, thinking that we somehow wouldn't notice... This is the sort of film that really should have just been abandoned, but producers desperate to recoup their cash couldn't bring themselves to do that. Instead, they tarnished the actor's legacy, and the film was both critically and commercially a flop.