Jack Cassidy, as Lt Horace Greeley, is being honored at a meeting. The sign for it says Honoring...Horace Greely (sic). Later on he is sitting at his desk with the nameplate of Horace Greeley on it.
At the A&W Root Beer drive-in where they are parked in the camper eating, the first word in the sign that says "TO LOW FOR CAMPERS" is spelled incorrectly: it should be "too".
As Bunny is being tossed around in the back of Bill's camper when he tries to sneak away from her, the three cans of beer on the little table remain firmly in place.
Towards the beginning of the movie they pull into an A&W Drive-In, yet inside the car he is drinking from a Dairy Queen cup.
When they're training to rob banks near the beginning of the movie, it's obvious that the two riding the motorcycle in the desert are stand-ins for Borgnine and Davis.