Continuity mistake: When Sara uses Rockford's knockout drops in Jerry's drink, Sara's manicured fingernails are quite long in the closeup yet considerably shorter otherwise. The ring on Sara's ring finger also changes to a very large turquoise ring in the closeup.
Continuity mistake: After engaging in off-screen various recreational activities right under his photo, Sara is telling the story of her father per Jim's request "One time, I couldn't find him for three weeks", she says; Jim's hand was on her lower back, it starts behind her head here. (01:15:00)
Other mistake: The bad guy collapses after drinking what Sara gave him, but in the close-up she managed to squeeze barely 1 drop of the substance and it went right on top of the horizontal ice cube. It must be the most powerful narcotic in the world, putting KO a mountain of a man within seconds with a single drop that arguably didn't even mix with the drink. Had she put a couple drops in, it would have straight up murdered him, then.
Other mistake: Jerry Grimes follows Rockford to the theater, sits at the bar, orders bourbon and water and waits for Jim to come out of the bathroom. Jim meanwhile set up a trap for him, which somehow does not affect anyone else, and Jerry ends up getting roughed up. He then drives off to this other joint, where he sits at the bar...which happens to be the exact same bar with the exact same posters as the other one.
Revealing mistake: The exterior shot of the house of the rich Miss Elias preceding Dr. Ruben Seelman's phone call, is a zoom on a static photography with a visible line on it. It is reused later in the episode (after Jim pulverizes his own picture in the phone book), with the exact same telling line. (00:30:20)