Continuity mistake: When the prosecuting attorney walks up to the witness stand with Peter on it, she stands off to the side. When Peter puts his hand on hers in the next shot, she's standing in front of it. (00:31:25)
Continuity mistake: When the judge tells the men to stand up, the position of the books in front of them on the table changes position between shots. (00:31:40)
Continuity mistake: When the Judge states his sentence, from Stantz's POV of the front of the table the pink goo in the jar starts bubbling with a tag hanging on its right side. From a wider angle of the front of the table not only is the tag not visible, but the ghost trap next to it is different (check the number of dials and looks of the box), plus the trap is now slightly skewed as to how it was positioned before. (00:31:45)
Suggested correction: I believe the tag is visible at all times, at least the string of it (the tag itself in the wider angle from the defence's table is hidden by the jar itself). Not sure about the mentioned box, you mean the ghost trap? My impression is that the different angle accounts for a perceived different placement, but it's just my perception.
Revealing mistake: In the courtroom scene, when the sample of slime begins to bubble and react to the judge's malevolence you can plainly see that an inflatable mechanism situated under the jar is responsible for the wobbling. (00:32:00)
Continuity mistake: When the Scoleri Brothers come (for whatever reason) out of the jar there are strong air currents all over the courtroom. The heroes are under the table, and you can see the winds knock down a few books above them. In the reaction shot on the crowd after Ray goes "Wooooow", you can see some of those books that just fell earlier still on the table. Look for instance at the two books by the red tome to the far left. (00:32:40)
Continuity mistake: The smaller Scoleri tosses the defense table at the judge's empty podium. In that sequence there are no burning fires (a tiny one quickly fades) and not even the glowing jar of slime. When the Ghostbusters arm up, the slime is smoking and glowing and fires burn at the judicial bench. (00:33:05)
Revealing mistake: During the courtroom scene, one of the ghosts grabs the prosecutor and she is hanging upside down. Her dress comes down a little, but when she is about to fly through the door you can see part of the dress is pinned to her panty hose to stop the dress from falling off. (00:33:30)
Visible crew/equipment: When the chairs are flying through the air in the courtroom, if you look closely, you can see the string pulling one of them. (00:34:30)
Suggested correction: This would need more clarification. I couldn't see any string in the mentioned sequences - and for the record, I don't think strings were used, you can easily find interviews with the production team that mention the different trick at work here (they quite literally 'shot' the chairs up in the air).
Continuity mistake: After "Do, Re, Egon", the Ghostbusters are nervously waiting for the Scoleri to show up, as if they knew they would. Just before the camera cuts to a close-up on Bill Murray, he begins to lower his head to look at his rifle, but in the close-up he is facing forward. (00:34:40)
Revealing mistake: During the sequence where the ghosts knock the courtroom chairs in the air, you can see that some chairs have one leg that looks oddly 'loose' or with something sticking out (as interviews with the technical cast members clarify, each chair had an extension part that went into the floor and was launched up by an air mortar). (00:34:45)
Revealing mistake: When Venkman is shooting at the ghost in the courtroom, if you look closely at the pillar his proton stream hits, you can see the area that is supposed to explode before it actually does. (00:35:25)
Audio problem: During the fight with the Scoleri Brothers, Egon warns doctor Stantz about the sudden apparition of the ghost coming through the wall. He yells "Behind you, Raaay!", but in the close-up Harold Ramis' mouth is not uttering "Behind you." (00:35:50)
Continuity mistake: When Egon sucks the Scoleris inside the trap, the three 'busters are spread across the courtroom, but in the close-up of the trap you see their legs being much closer - and you can see for instance by Peter's stance that there's no real continuity. (00:36:20)
Revealing mistake: A Ghost Runner scares the people having a jog in the park. When you first see this peculiar ghost (who even checks his own pulse, funnily enough) the extras react to him with timing wildly off; the ones further back in the curve react when the ghost has already passed them by, but turn towards the middle of the track as if he were right there. One of the last people reacting is a woman who didn't even make it to the curve in time to see anything. (00:37:20)
Continuity mistake: When the ghostbusters are yelling at the jar filled with plasma, on the close-up Venkman's hand is around a metal thing, but on the wide angles it is just by its side. This keeps changing back and forth. (00:39:20)
Continuity mistake: When Ray screams at the slime that "YooOOOuuUUU take the cake" his wrists in the background are crossed and the watch is visible. Cut, and his hands are joined and the wristwatch concealed. (00:39:45)
Visible crew/equipment: When they're yelling at the pink slime, one of them places a toaster next to the slime. A big lighting screen gets reflected on the metal structure. (00:40:40)
Revealing mistake: When they gather around to watch what happens when you put the slime in the toaster, you can see when the toaster starts popping that it has little pneumatic pistons attached to the bottom, making it jump. When the toaster gets picked up off the table you can view its power cord which is entirely too big - more likely air lines. (00:41:15)
Continuity mistake: During the dancing toaster scene, the pool balls' position differ depending on if the wide or close angle focuses. (00:41:25)
Continuity mistake: Peter drops by the museum to see Dana. As he enters room 304, a worker there is wheeling away a big crate. Cut, and the crate spun 90° (just check the stickers and the "Keep dry" writing, first on the right side, then on the side facing the worker). (00:42:40)
