The Disney Theme Parks are packed with details that you may not notice. The Hollywood Tower Hotel at Disney California Adventure is filled with them. As mentioned previously, the Hotel was specially located so that if it had an outside address, it would be 1313 Harbor Boulevard. (An appropriate address for a haunted hotel.)
The details continue inside the hotel's lobby. If the "concierge" at the bell desk guides you to the left side doors, look up at the door number- 22.
A random number? No- it's a reference to the classic Twilight Zone episode Twenty Two, which starred Arlene Martell as a maniacal nurse who creepily insisted that there was "room for one more" in the hospital morgue.