Factual error: The Infinity Gems are the main plot point used in this game, and yet their color is incorrect (for the Marvel canon of the time); the Power gem here is colored magenta, and the Time gem is cherry red. They should be red and orange (and the Reality gem should be a less warm yellow, it practically is orange here).
Suggested correction: This is a discrepancy between the game and the comics they are based on, which is by site policy, not a mistake. By the same token, Thanos is the final boss of the game, whereas if the game was following the comics storyline, he would have been an earlier boss and then an ally, and the Magus would have been the final boss.
Technically there is not a "War of the Gems" saga in the comics? It IS obvious that the game is an adaptation of Infinty War taking plenty liberties but it's what adaptations do.At the time of the release of the game, the color of the gems was canon and I think a minute difference like this hardly falls under an artistic license like your example; they simply picked poor matches with the original colors making everything confusing. However yes, ultimately it IS a discrepancy, so.