Both Haunted Mansion and the Pirates of the Caribbean are rumored to have both been temporarily shut down due to guests spreading human ashes on the rides.
Disneyland is home to a large crew of feral cats that have been welcomed to stay due to their pest control instincts. If you're lucky, you may spot some at the feeding station over near the Hungry Bear Restaurant.
Disneyland's opening day faced significant challenges with an unexpectedly large crowd, several ride closures, unfinished Tomorrowland, food shortages, and hot weather causing problems like sticky tar-like pavement, earning it the nickname "Black Sunday" among cast members.