Other mistake: The DVD release was created with a "pseudo widescreen" as various scenes cut off major action. The most obvious is in the beginning of the film when the main character meets the crazy girl. Her head is framed bottom right but the widescreen completely cuts off the crazy girl's head. This can be explained by the enormous aspect ratio of the original film, which is bigger than standard (USA) widescreen, that or a bad transfer.
Other mistake: One joint, already partially smoked by Bobby and Jonathan when Mrs. Glover enters the room, gets passed around a few times and lasts for an unusually long period of time. When it is already too small (barely big enough to be held), more hits are taken but the joint doesn't really get smaller. (00:12:42 - 00:17:03)