Anyone watching highlights won't have the same experience of seeing it in real time. The ref blew for a goal and the teams returned to the centre except for 3 Bournemouth players who protested to the linesman.
At first I thought the scorer was offside but on the first replay, (which was probably what the ref saw) it appeared to have come off a Bournemouth defender.
They then showed a other angle which showed it had actually rebounded of a Luton attacker, so was offside. I thought OK, so the ref got it wrong, get in.
Then the linesman puts his flag up.