Regarding the net that was dislodged, only my observation but when the Zamboni re-iced after warm up the guy replacing the pegs clearly didn't have a clue how to:
1) Drill the holes, he only went down half of the drill bit at most,
2) didn't know the rubber peg had 2 different diameters (one for the ice, the other for the inside of the post) so both were inserted differently.
3) he didn't test it after siting the net.
We may need to look at ourselves a bit