Plot hole: Johnny's dad jumps in his truck and gets to Johnny in moments. That same journey was shown to be an overnight bus journey for everyone else.
Continuity mistake: Throughout the entire movie, Porsha's fur keeps changing from a light blue to a dark blue.
Factual error: Johnny's dad and gang come to over protection services to Moon and the singers. Despite almost no time having passed since the first Sing movie, as evidenced by Rosita's children having not aged, the gang appear to have been released from prison. The gang were in for armed robbery and at least one case of escaping prison. The minimum terms for those charges would keep them in prison for years.
Continuity mistake: The three white rabbits in the opening scenes have red, purple, and pink sunglasses. In the revealing shot for Rosita, two of them are wearing purple and one of them is wearing red. In the next shot, their glasses return to normal.
Continuity mistake: Towards the end, before his arrest, Mr. Crystal's fur is messy; it goes back to being clean less than 2 minutes later when he steps on stage.
