So in Chapter 5 there are a lot of missed opportunities:
Huggy Wuggy took the original Grabpack we had and later he chased us sometimes and was roaming around in one part but if he was wearing the Grabpack it would be cool like him using the purple hand to jump over you, shooting you with the flare hand and more... It would make Huggy a bit more interesting.
And the Prototype could have had a bossfight, not just a chase, a bossfight before the chase would be cool and from my Huggy Grabpack idea, the Prototype could take the Grabpack from Huggy after he attacked him and wear it and fight.
And the ending could have had the commercial form of the Doctor which is shown everywhere from McFarlane Toys, The Doctor Answers questions videos and more... They could have used that form of The Doctor here instead.