Here’s an interesting bit of California Disneyland Mansion lore. Around the summer of 1974, someone with a firearm within the park fired off multiple rounds. Two confirmed gunshots struck both the ballroom wall in the Haunted Mansion, and a snowflake on Adventure Thru Inner Space. A third hole was found in the Primeval World diorama on the train. Later investigation by Anaheim Police determined the holes to be .22 caliber with bullet fragments matching between the holes.
This left Disney with a problem. The panes of glass at the Ballroom scene are so large, the roof of the building would have had to be removed (i.e. destroyed) to replace them. Disney’s solution was to cover up the hole in the glass by disguising it as a spider web and place a fake spider right over the hole. So next time you ride the Haunted Mansion at Disneyland, when you leave the ballroom scene just before entering Madame Leota’s room, look for a spider and web on the last pane of glass in front of you.