As Steve jumps from a tabletop to a ledge to join his friends at a mouse hole, Gary Conway (who plays Steve) jumped too far and accidentally went into the wall. Due to hurting his arm, he was unable to lift himself up from the ledge without help. Don Marshall (who plays Dan) saw the scene went wrong, got Don Matheson (Mark), and they went to help. After Gary is safe, you can see Don Marshall mouth "are you okay?" Gary nods yes, but can be seen holding his right forearm.
The Spindrift is not seen in this episode.
Vic Tayback and John Harmon were both in the Star Trek episode "A Piece of the Action" A Piece of the Action (1968) together.