The chase through the drive-in theater took place at the Pickwick Drive-In in Burbank which was torn down about ten years later and replaced with a Von's Pavilions and a shopping center.
The marquee on the Pickwick drive-in theater (since torn down) which Jim (James Garner) and Angel (Stuart Margolin) drive into, has Once Is Not Enough (1975), and The Gambler (1974), listed as currently playing. Stuart Margolin had a supporting role in the latter film.
In this episode, we learn Rockford's a fan of music by Ella Fitzgerald, and Count Basie. He has them recorded on reel-to-reel tapes.
The fact that Sturtevant picks Rockford's name out of the phone book at random is yet another allusion to Raymond Chandler's novel Farewell My Lovely (1940), in which Lindsay Marriott picks Philip Marlowe's name in exactly the same way, involving him in no end of problems.
The preview to this episode contains a different take of the J-turn scene than the actual episode. In the episode, the driving is witnessed from a more aerial perspective, while it is filmed much closer-by in the preview. Since this camera would have been visible from the aerial perspective, it's clear that this is another J-turn alltogether.