In the bar scene with JR strutting her stuff she is wearing tights, but later she is rolling down stockings before getting into the tub.
When Junior and friend are going to bed, his friend blows out the light, which is from an oil lamp. To extinguish an oil lamp you have to lower the wick .
Twice Bob Hope mentions that Harvard University is in Boston. It's in Cambridge.
When at the start of the movie Roy Rogers sings "Four legged friend" his stirrups have blue covers with "RR" on them, denoting Roy Rogers and not his character's initials.
After Roy Rogers completes his visit with the governor on the stage coach, Roy climbs out on top the coach and catches a limb from a tree. As he is hanging there he whistles for Trigger. When Trigger comes out from behind a bush, you can see the leg's of a person who was holding Trigger behind the bush until Roy called.