I think there were a ton of problems with the offence.
I think Canada's playcalling looked predictable and scared. The only time the offence really seemed to flow was in overtime when either Canada had to loosen things up and take risks, or things went off-script and Trubisky was making plays. It seemed like the main objective of his offence was never lose the ball which I guess they achieved, well done, you punted it away a ton instead. Nevermind the nature of the win, a better offence means TJ Watt isn't on the field to make that play in which he tore his pec. Well, okay maybe he is because Tomlin, but he shouldn't have been.
I think Trubisky's accuracy was noticeably bad. I'm not prepared to write him off after one game but he can't continue like that.
I also thought he looked reluctant to use his legs and reluctant to make a short pass to the RB, and I don't know if I'm blaming Canada or Trubisky for that. My one big hope for the offence this season was that increased QB mobility would increase uncertainty for the opposition, but that's a big fat negatron.
The offensive line couldn't give any RB a chance to get to the second level with a head of steam. Pass protection, some bad, some good... but I think to a certain extent the plays were being called to avoid being too much stress on it.
I also don't understand some of the personnel out there. They barely looked at Pickens. Boykin isn't really the guy you want on your first big throw of the day.