Dirtwater gets into the Bloodworth gang's camp finds a padlocked box, puts a stick of dynamite on the lock to blow it open and there's three explosions.
When Malloy falls off his horse and remounts, the remount is
reverse footage of the fall as the people in the background are moving backwards.
"Hava Nagila" is sung and danced at the Horowitz' wedding. This song would not be composed until the 1920s, years after this film is set.
When Bluebird walks out of the saloon into the streets, you can see modern houses all along the hills.
The film's raunchy language may have been toned down in post-production to prevent an R rating. After the stagecoach crashes, Goldie Hawn has two lines ("I had to look like a *blue-nosed* duchess" and "It's still there in the *lousy* bottom") neither of which match up with her lip movements.