I made the background of the monitor opening transparent to fit the previous scene in, and when Creepy Carl fades away it is also transparent. I thought of the whole collab, not just my part.
Thank you to @jj170711 for most of the rooms and Charlie, thank you to @GamingPlus100 for Creepy Carl and the orange room, thank you to @Aquaz for Happy, thank you to @Kylan20138 for Porky The Pig, and thank you to @Smirky for Fix It Freddy.