When Evelyn is on the phone at the airport, she tells Dave that she has a job in Hawaii and she reads a line from a poem "Because this maiden she lived with no other thought than to be loved by you." Later on, Dave is reading a book before he rescues Tobie, Evelyn's voice over says the same line, but the line in the book that Dave is reading says "And this maiden she lived with no other thought than to be loved and be loved by me."
When Dave and Tobie are walking on the seashore Dave is seen on the right of her in a long shot but when the angle is changed to medium he is on the left and back on her right when the angle is changed again.
After Dave punched Evelyn in the face she busts through the glass door facing the left side of the screen. As she's falling over the railing her body has done a complete 180 and is facing the other direction.
When DJ Dave Garver leaves the radio station KRML to go rescue Tobie, he puts on a 5" demo/air check reel on the tape recorder. A reel of this size could hold, at maximum, 600 ft. of tape. Playing at 7 1/2 ips (which is the speed most radio station recorders recorded/played music back at using 2 channel, 2 track recording - common for commercial/broadcast recorders), this would have given only 15 minutes of recorded music/voice before the tape ran out and "dead air" would have been transmitted from the station. Yet, Dave Garver made reference to Sgt. McCallum that Tobie lived way outside of town. The movie also conveys the driving time Dave Garver took to get to Tobie's house. Considering that, the fight scene at the house and when he leaves the house with Tobie at the end his request to play Misty is heard over the air, Dave would have had to mount a 10" reel containing 3600 ft. of tape (1.5 hours of recording at 7 1/2 ips). Radio stations would normally have had such reels for recording entire shows. They are not used for demo/air check tapes.
Tobie tells David she thought Evelyn had been sent to a 'sanitarium' (a health resort). The correct term is a sanitorium (a psych hospital). It may be a deliberate goof, though, given that later, Evelyn pities Tobie for being 'so dumb'.
In the scene where Evelyn creates a disturbance as Dave is having a business meeting with an executive from a San Francisco station, there is a close-up of the box containing the audition tape he originally sent to the station she runs. The return address reads Dave Garver, Radio K.M.R.L. (not K.R.M.L).
The VU (audio) meters on the KRML control board are motionless during music and voice input, indicating that the station is either off the air during filming or that the actual audio source is elsewhere.
The goof items below may give away important plot points.
At the radio station, when Dave threads up the tape recorder to play back his previously recorded demo tape so he can leave the studio to save Tobie from her "roommate", he mistakenly twists the tape in the machine. This would have the effect of playing the back side of the tape. At best, a very muffled playback of the tape would occur if the tape were threaded in this manner. At worst, nothing at all would be heard.