Dennis the Menace; Alice Mitchell; Mr. Bixby (billing manager); Miss Anderson; telephone callers; telephone operators; office workers
Alice goes to the telephone company office to complain about being billed for a call to England. It turns out that Dennis made the call, and he also thoroughly disrupts the telephone office and switchboard.
Dennis the Menace; Alice Mitchell; Henry Mitchell; motel manager; lifeguard; pool boy
Dennis wreaks so much havoc in a motel that the manager paints a sign saying "no children wanted." Dennis blots out the first word when they leave, so the motel is soon inundated with families and kids.