John Candy sadly passed away due to heart failure while making this Western spoof. Unfortunately, it's a poor epitaph for the man.
As a result, several scenes written for him weren't filmed - something that's pretty obvious since there are a number of conspicuous stretches where he isn't on screen. While co-star Richard Lewis tries to carry the film during these sections, he... well, let's be frank... could barely carry a bag of feathers, metaphorically speaking.
Then again, even if Candy had remained alive for the duration of the shoot, this probably wouldn't have been much good anyway. About 90% of the attempted jokes are painfully unfunny and embarrassingly juvenile. Camp gay? Check. Fart lighting? Check. Implied bestial relations with a cow? Check.
If you see this on the horizon, it's best to just turn your wagon back pronto.