When Phoebe was talking with her girlfriend in the basement she was wearing the ghostbusters suit. Though she was grounded that time, her mom overlooked that she was wearing the suit. Sorry... Director overlooked.
Few more things:
1) How mee-maw got so young in this sequel?
2) When Phoebe took her 2 minutes power nap, Garraka came out. Lucky confronted Garraka. But Garraka gave her only chill but did not kill her. Few moments later when Garraka went for some smoke in gas station (probably), it killed the employee. This is simply contradictory.
3) Orb is the only prison according to the folklore but how ghostbuster's capturing device is keeping garraka imprisoned? (I think this question is answerable)
Some suggestions:
1) Venkman's appearance is pretty random not consistent. Which could have been more consistent.
2) Probably they tried to make this sequel more about Phoebe. It would have been better if it was focused more about the story.