Continuity mistake: While Cliff punches the hippie guy, the sun changes between shots.
Plot hole: Manson is able to walk right up to the Polanski residence door, but Sharon's girlfriend and Rick Dalton are prevented because there is a security gate.
Factual error: Rick Dalton, relaxing on a float in his swimming pool, tunes his radio to 93 FM. A KHJ jingle is heard but KHJ was 930 AM. The station at 93.1 FM in 1969 was KNX-FM.
Other mistake: Rick Dalton's Cadillac has a badly worn steering wheel. In 1969, the car was not old enough to have had that much wear. It should have been painted.
Factual error: When Cliff is driving back to his trailer at night, he drives past a lit Subway restaurant sign. The first Subway on the West Coast did not open until 1978 in Fresno.
Factual error: On the Hollywood 101 freeway, concrete "K" rails can be seen in the center divider. In 1969, the older steel rails were still in use in California.
Continuity mistake: When Rick is talking to the girl on-set, he's smoking. A couple of times his hand is up in one angle, then immediately down in the next, then back.
Factual error: The Karmann Ghia that was used had chrome steel wheels, not a factory option even on U.S. spec models.
Suggested correction: It is said in the specials, that stuntmen in that time loved chrome wheels. So it need not be a factory option.
Other mistake: George is blind but when talking to Cliff and telling Cliff he is touched that he came by to visit, George hits Cliff's left shoulder with his fist, a nice direct hit.
Factual error: Pandora's Box is shown as part of a driving montage, but Pandora's Box was demolished in 1967, two years before the 1969 setting of the movie.
Continuity mistake: Just before Rick's appearance on The FBI is shown, Rick is holding a cigarette in his left hand and a can in his right hand. It then cuts to Rick pointing at the TV, and the cigarette and can are both in his right hand.
Factual error: A white van with an 80s or 90s body style can be seen going from left to right in the background of the Manson girls dumpster-diving scene. (00:15:51)
Continuity mistake: When director Sam Wannamaker is talking to Rick, who is sitting in the makeup chair, Rick's hair goes from loosely hanging down on his forehead to suddenly being neatly slicked all the way back without it having been touched.
Factual error: The Manson Girls are dumpster diving a Super A grocery store, in 1969, bu the chain did not open until 1971.
Continuity mistake: When the Bounty Law credits disappear there's a man with his right leg over his left. Shot changes and now it's the left leg over the right.
Revealing mistake: At one point when Cliff is driving the Coupe the ignition key which is located on the upper dashboard is in the off position.
Continuity mistake: When Rick is in the pool listening to Snoopy and the Red Baron, his radio is to his right. When the girl crashes through the window, the radio is to his left.
Continuity mistake: When Pussycat is rebuffed from her offer to Cliff to blow him "while driving" she lies down on his lap facing up to him. Between the two camera shots her arm alternates between being out the window or on the arm rest. (02:34:43)
Factual error: Cliff is shown drinking a Coors Light in his trailer but Coors Light didn't come out until 1978 and the movie takes place in 1969.
Factual error: The Cielo address is mentioned in the movie as being in Hollywood. It was actually in the Benedict Canyon section of Beverly Hills, several miles away from Hollywood.
