Former Wallaby No8 Scott Higginbotham was involved in one incident when he stripped the ball from Bristol's Semi Radradra, propelling the ball forward in a knock-on.
Higginbotham then set in motion a breakaway movement that resulted in a crucial try. However, in reviewing the incident via the TMO, only a small number of angles were reviewed, before upholding the referee's on-field decision of a try.
Bristol's captain Callum Sheedy was furious as his side had been looking for a try when five points behind only to end up 12-points down.
Then, a controversial hit forced a Bristol player from the field. But, following a five-minute review in which only a small number of television angles were viewed, it was ruled there had been no foul play.
The French side ended the game with only 13 men on the field. But Bristol could no utilise that advantage as more reviews slowed its momentum and resulted in the game lasting around 120 minutes.
Lam commented they would send some feedback to the referees' group once they had reviewed game coverage.
"But the way we grow, and the way the referees grow to, is the feedback.
"We also like to highlight good calls that are made so we're fairly balanced. And, then, it's over to Joel Jutge [match officials' head] to give the feedback to the referees," Lam said.
However, in assessing the Higginbotham knock-on, Lam said, "There were more than two cameras out there. I'm surprised it took that long a time. It doesn't normally take that long. The TMO was right behind us, we could hear him, and they seemed to be asking for angles, and it took a while for that to happen.
"It's over to the referees and the broadcasters to find the feedback, and ask the reasons why it took so long," he said.
Northampton coach and former Hurricanes coach Chris Boyd's side had better luck in the European Challenge Cup when coming back from 17-32 down, and playing with 13 men to beat the Dragons 43-39 away.
Boyd told media after the game, "The first half was rubbish. We made dumb decisions and didn't work hard enough. We talked about if we played with tempo we might get some joy in the last 15 minutes and that turned out to be true when we put the hammer down.
"I don't think either defence coach will be happy – I thought we were playing tag at half time," he said.