Where the Wild Kings Are - S1-E5
Visible crew/equipment: When the twins are tied up in Pupaley's cave, just as they get on their knees and beg to be let go, the hand of a crew member holding the end of the rope is visible at the right of the screen. (00:19:25)
Other mistake: King Boz helps put out a fire with an extinguisher that is not operating; there is no mist exuding from it yet the flames go out.
Visible crew/equipment: When Brady and Boomer are in the tunnel being chased by the rat, when Brady says, "I think we woke up the whole flock," Boomer's mic transmitter is visible, clipped to the back of his shorts. (00:15:40)
Long Live the Kings, Part II - S3-E19
Revealing mistake: As Boomer fights Kaita, its obvious to see it's a taller stunt double doing the flips and kicks; Kaita is taller than Boomer in all the other shots but they are eye-to-eye during the fight.
Continuity mistake: In the flashbacks to when Boomer was going to sing at school, the audience never changes clothes or seats despite every scene being a new event and year.
Continuity mistake: Mikayla complains she's defenseless after Boomer throws her machete overboard from the yacht; later in that episode she pulls out a back-up machete to fight the giant toad.
Other mistake: When Brady hooks the Tarantula person's leg to trip him, the hockey stick never touches the actor's leg, yet he flips anyway.
Revealing mistake: When the king of Cornea puts on his sunglasses, you can see the set lights, the light rigging and two monitors reflected in them.
Plot hole: Kings Boomer and Brady had to earn their king rings and the powers contained within, however, King Boz was just handed the ring, yet it kept its power.
Answer: No. Although Mikayla and Mason occasionally referred to the mother, her whereabouts were never revealed.