The shot of Leonard Nimoy used during this season's opening credits (showing him in a red shirt with a colorful neckerchief knotted around his throat) comes from this episode - the scene in the bar when he first talks to Enid (Jill Haworth).
The scene at the end where Paris (Leonard Nimoy) smiles and says "Jim!" after trying to kill Jim Phelps is reminiscent of the ending of the Star Trek episode "Amok Time" where Spock (Leonard Nimoy) does the same thing after trying to kill Jim Kirk.