After Tennessee and Trixie's performance in the bar, a bar patron comments that it was better than Eagles. The patron is Don Henley, who is one of the founding members of the Eagles and who provided the singing voice for Tennessee. The female companion he says it to is Bonnie Raitt, who provided the voice for Trixie.
When the phone tracing is being set up in the Barrinton house, Officer Cheets hangs up the handset on a phone. In the next shot it is still in his hand.
After Beary and Henry get into the bus to go get the band, there is a shot of Beary hanging out the window of the side of the bus. In the shot, the bus is clean, but this is before the bus goes through the car wash. The next outside shot of the bus shows it dirty.
When Fred is in the boat on the way to save the rest of the crew, he turns the corner the boat goes up on one wheel and the two extra wheels underneath that make the stunt possible are briefly visible.