Continuity mistake: In the barn dance scene Gideon is doing flips on the sawhorse. His shirt becomes untucked and then retucked between flips.
Continuity mistake: When Marilyn Monroe tries to untie the raft and Robert Mitchum can just catch the rope it the river flows from left to right. Later, when they take off again together, the river flows from right to left.
Revealing mistake: Many of the cavalry soldiers were carrying M-1 Garand rifles (WW2 era rifles).
Continuity mistake: When Porky tells Daffy to arrest Nasty Canasta, you can see the window next the door has four panes of glass, but when Daffy challenges Canasta to a fight, the number of panes has increased.
Continuity mistake: When Tom rushes up with his knife, fork and dish to get his dinner from the cook, you can see that Tom's knife is pointing straight but in the next shot it is now pointing to the right.