Hutch's milk-swilling bit is, no doubt, taken from Barnaby Jones, where Buddy Ebsen's title character's trademark was drinking only milk.
The personality Hutch exhibits while undercover sounds a great deal like Professor Julius Kelp, Jerry Lewis' clumsy character in "The Nutty Professor". His ill-fitting clothes were also a trademark of Julius.
The bad guy is holding one of the model's hostage, shooting at Starsky's head bobbing up and down like shooting gallery target. The bad guy's out of bullets. Hutch takes advantage swings by a rope hanging from ceiling and a mighty Tarzan yell, swings across the pond knocking the bad guy and his lovely hostage into the pool along with Hutch. The female hostage swims over to the edge of the pool and (43:55) very discreetly pulls up her swimming suit top where it had come loose from the crash in the water. Meanwhile, Starsky gets up from behind the pool happy with their success and with a very audible thud, when he smacks his head on the beam above the pool. (44:05) PMG can't help but react.