Other mistake: When all the animals visit Dolittle at his apartment and he turns on the light in the hallway, you hear a click and the lights turn on, but there is no light switch.
Revealing mistake: Dolittle's daughter is in the woods holding the cell phone talking with his dad about the dog he is bringing, but the phone screen is off all the time.
Continuity mistake: The crack on the alligator eggs keeps changing abruptly between shots, sometimes totally open, others almost closed without any logical order whatsoever.
Answer: Lucky is a mongrel mix. A mix of 2 breeds. A quick search suggests a possible terrier and lab mix.
Ssiscool ★