There's already been a disallowed goal in Game 6, with Evan Bouchard from the Oilers denied a buzzer-beater due to goalie interference. The refs called it off right away, so the Oilers would've needed clear video proof to change the call.
Goalie interference calls have been a bit all over the place this playoffs, so it's no surprise the Oilers and their coach Kris Knoblauch decided not to challenge it. The Oilers are fighting for their season, trailing the Canucks 3-2 in the best of seven series.