When the bus arrives at the town it stops beside a high curb and when Dr. Carl steps out he has to climb it to get to the sidewalk. When the bus leaves there's no curb where the bus or Dr. Carl stood.
In a scene at a bar, supposedly set in a flashback to sometime circa 1977, Hot Chocolate's song "Every 1's A Winner" can be heard in the background. That song would only be released in March 1978 in the UK, and in November 1978 in the US, where the story is set.