Friday the 13th: Part 3 - Crew in Car Window Reflection
When Shelly & one of the girls get back to the cabin after their run-in with the motorcycle gang, Chris & Rick talk for a few minutes then get into the yellow VW Beetle. After Rick gets in, you can clearly see two crew members in the reflection of the car's rear left side window. This is at just under the 36 minute mark into the film.
Copy of movie