Noel Acciari’s waved off goal wasn’t the only controversial part of OT.
Shortly after that incident, David Backes took a poke at a loose puck in the crease. JG Pageau made a desperation dive back into the net to try to save the puck, and in doing so kept it out.
However, he also appeared to gather the puck into his body, which, when it occurs in the crease, is an automatic penalty shot.
The video, from NESN:
This is a player gathering the puck into his body in the crease.