Scheifele scored a hat trick and had three assists, while Hall scored twice and added four assists. Anthony Camara, also with three assists, and Tyson Fawcett each scored singles for Barrie (9-2-0), which is now on an eight-game winning streak.
Fawcett's goal was the first of his OHL career.
Andreas Athanasiou picked up an assist for Barrie, extending his points streak to nine games.
Both Graovac and Camara scored their 10th goals of the season, tying them for the OHL lead.
The game featured the league's top two power plays, and they did not disappoint. Barrie went 5 for 8 on the man advantage while the 67's finished the evening at 2 for 4.