When Aladdin is snooping around in Gold's shop, one of the items he passes is a toy monkey wearing a fez and playing cymbals - a nod to Disney's Aladdin (1992), in which the titular hero had a monkey sidekick named Abu who was turned into a toy monkey playing cymbals by Jafar.
Dr Whale suddenly has bleach blonde hair, this is because David Anders also had a reoccurring role in iZombie which involved bleaching his hair.