Factual error: After Albert feeds the pill to the turtle, you see a close up of its eyes, which are blue. Turtles only have either brown or red eyes, not blue.
Factual error: When Merlin and Arthur are squirrels Merlin says squirrels mate for life, which is not true. Squirrels are promiscuous.
Factual error: When Clay Spencer and his brothers begin work on his dream house, they mix and pour the concrete for the foundation, then immediately begin putting up the framing. The concrete would have to cure for at least two weeks before the framing could be started.