The Legend: Mickey Mouse never appears at two places in
Disneyland at the same time.
Behind the Legend: Can you imagine the confusion of a small child who saw Mickey in his movie barn, exited to see Mickey signing autographs in the gazebo at Toontown's center, and then walked past "it's a small world" to catch a glimpse of Mickey on a float in a passing parade? This used to happen quite a bit, forcing parents to make up ridiculous stories like, "that one's Minnie dressed up like Mickey," or "it's one of Mickey's helpers," or "the characters are just people in costumes." Even so, many children had their blind faith in things that are fun but couldn't possibly be true ruined for life.
Fortunately, in January of 2004 Disney took steps to make sure that this kind of problem can never again arise.
A master computer now coordinates all appearances of Mickey Mouse (and, soon, other Disney characters). If Mickey is appearing in a parade, his meet-and-greet in Toontown is closed. If he's signing autographs in Disney's California Adventure, he's not signing them in Disneyland. And just to make sure that the effect is perfect, the computer ensures that there is enough time between appearances for "Mickey's" supposed travel and costume changes.
Although the system works well, there are still a number of bugs. For example, a family that visited Disneyland in the morning and then hopped on a plane and visited Walt Disney World in the afternoon and saw Mickey in both locations could be told that Mickey simply got on a plane at the same time they did. However, if half of the family went to Disneyland and the other half went to Walt Disney World on the same day and brought home time-indexed videos of their trips that both showed Mickey at around the same time, that explanation would not hold water. For this reason, a plan is being hatched (to be rolled out some time next year) to coordinate Mickey's appearances globally so that he does not appear in two places on the planet simultaneously.