It was never major stuff, just stuff that's major in the wrong market. In Buffalo or Winnipeg, it's not even worth mentions but in Toronto or Montreal, it's talk show gold.
Canadiens prospect Nathan Beaulieu, father Jacques plead guilty to assault
The party incident where him and Christian Thomas were photographed having too much fun for the team's liking (broke curfew, team didn't like where when and how they partied). They went clubbing after a Montreal loss and got photographed a bunch partying at 530am.
The report that came out that Kassian was partying with NB the night Kassian crashed the car which saw Kassian get traded.
The photo of NB supposedly doing cocaine that was in the papers during the last playoff series he played on Montreal a couple months before he got traded.
It's over a 5 year period and most of it is overblown young rich kid partying thing but Montreal had a culture on the team if didn't like and traded away the guys they felt caused it (Galchenyuk, Thomas, Kassian, DSP, NB etc etc with Patches partially being a casualty for not being able to lead through it). Montreal's off ice perception of him is why he was traded before the expansion draft.