When Manson is talking to Dennis Wilson about Terry Melcher's refusal to continue recording Manson, the cord from the phone to the receiver changes from being tangled (or kinked) to untangled and back again. (at around 36 mins).
The film tells us that Spahn Ranch was in Benedict Canyon. Sharon Tate's house on Cielo Drive was in Benedict Canyon, but Spahn Ranch was several miles away in Chatsworth.