Unless I missed something I had a hard time nitpicking this episode. I only found two things.
The Ghostbusters arrive at the power plant after averting the Containment unit disaster. They get out of Ecto-1 and Slimer sits in the driver’s seat and starts playing. The car starts to move. Ray turns around and says, “Hey, the car’s rolling” but it is Peter’s voice.
When the possessed Ecto-1 is chasing the Ghostbusters, Slimer is seen fleeing right alongside them. The high angle shot shows all four GBS running with Ecto-1 in pursuit but Slimer is nowhere to be seen in this one shot.Read more >
As the episode begins the Ecto 1 is cruising down the street and the music comes in a tad late in the opening of the song. You can hear it abruptly start missing the first few notes of the music.
As the Ecto drives away from the camera and over a hill the license plate incorrectly reads as ECT-1.
In what is the first of MANY of this error, just as the Ghostbusters break in the door and enter the chocolate factory Ray enters first and runs off camera. He is followed by peter, Egon and then another Ray! Actually the character model is Winston but has been improperly painted as Ray. This error happens often in the series.
When Ray gets hit in the face with chocolate and falls to the floor it appears the straps for his backpack are missing.
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