When Stretch is pulled from his wrecked vehicle, his left knee is injured. Later, in the hospital, it is his right knee that is in a sling.
In the car chase, Stretch is driving a two-tone red and white 1957 Mercury convertible. After the crash, it is an all-red 1954 Mercury convertible.
A line of 4 cars pulls into the parking lot at Jack's Casino, then all leave their cars parked in that line and go inside, blocking all the other parked cars. None of them actually parks, but later, when Bunny and Jim, then Gail and Eric go outside, no cars are in the lane; they're all parked. When Stretch leaves after the Gail "incident" and Eric follows him, they both pull out of parking slots into the lane to leave, then out onto the road.
Stephanie Powers knows that Troy Donohue is a basketball player before he's had a chance to tell her.
Gayle's luggage was left on bus when she rode with Eric, but then she had it for Stretch to carry to her room when she checked into motel, even though the bus had not yet arrived.
The team is still playing even though they are on "Easter Vacation", well after the season would have ended.
When the group goes to Jack's Casino, the first shot shows a real location, but the next shot, as they stop and get out of their cars, is a noticeable switch to a studio set. The outside of the building is different, and the background is obviously artificially illuminated and painted. A bit later when the couples go back outside to the parking area, rows of studio lights can be seen reflected in the cars' windshields.
Eric Dean drives a big cushy Thunderbird with a V-8 engine with an automatic transmission. When he's peeling rubber, it sounds more like a 4 cylinder Austin Healy.
Palm Springs and Las Vegas share the same desert (Mojave) but are 232 miles apart, a good four hour drive. Yet the group makes it there and back in one night and manages to take in a show, drink and dance.
When Jim Munroe left the nightclub, he gets into a car and follows the T-Bird and Stretch's red convertible. However, he had come into town by bus.
At 18 minutes: during check-in at La Casa Yates motel, as Connie Stevens' character is walking away, Naomi Yates calls out,"Annie", even though no name was mentioned at the time and at no time during the film did Connie Stevens' character ever call herself Annie.