A familiar subject but one that will not disappear until some form of video footage is introduced. The latest evidence arrived via two potentially game-changing decisions last night. Was Glenn Murray offside for Palace’s first? Probably but it was sufficiently marginal for referee Mike Oliver, as well as his assistants, to be absolved of serious blame. Palace will also remember that they had an onside goal disallowed against City at the Etihad Stadium earlier in the season. Yet both incidents could have been quickly settled within seconds. Murray was far more fortunate in the second half when a blatant handball was missed. Yes, Oliver should have seen it but such obvious – and occasionally inevitable – errors should also be instantly rectified.