Butland escaped punishment from referee Robert Madley for his 17th-minute challenge outside the area on Andre Ayew, even though he went in studs first on the Swansea striker after his bad touch had let the ball run loose.
The incident was replayed three times from different angles on the Liberty Stadium big screens and provoked an angry reaction from Swansea supporters.
Swansea could now find themselves in trouble as Barclays Premier League rules stipulate that big screens should not show controversial incidents or events which question the match officials' judgement.
League rule 39.4.1 says: "The screen shall not be used to show action replays of negative or controversial incidents"; and rule 39.4.2 prevents "any incident which brings into question the judgement of a match official".
Swansea do not have control of replays shown on the two big screens at the Liberty Stadium with Preston-based company ADI choosing which footage is replayed during matches from their central hub.