Harry gets a telephone call from the Morton Service Station that his car is ready to be picked up. It cost Harry $297 for a tune-up. He says "That's what I get for letting relatives do my repair work." This implies that Harry and Lucy have have relatives with Lucille Ball's real-life surname.
In the prior episode Viv is blind as a bat without her glasses, but in this episode she seems to see quite well without them.
The alternate title of this episode was "Lucy and Vivian Vance." The two titles are used interchangeably, even on the series DVD.
Harry drives a 1970 yellow Plymouth Satellite convertible license plate JNA-035. In "Lucy at the Drive-In Movie" Harry drove a 1965 Yellow Dodge Dart convertible license plate WMO-526, which was the same car Craig took his driving test in during "Lucy Helps Craig Get a Driver's License".
In line to cross the border is a 1968 red Sunbeam Alpine GT. The passengers appear to be the same couple seen shopping in Pedro's Bazaar in the previous scene. The line of cars also features a red 1970 Dodge Challenger.