343 Industries has made plenty of improvements to Halo: The Master Chief Collection since its controversial release years ago, but one outstanding problem is that the visuals of Halo: Combat Evolved never quite matched the original Xbox version. That oversight will finally be addressed soon, as the latest flight for Halo: The Master Chief Collection introduces bug fixes that “improve the classic visuals in H1 to better mirror the original Xbox version.” A comparison video shared by Generalkidd demonstrates many of these changes, such as improved textures and the return of certain effects (e.g., energy shields turning red when they’re shot).
Corrections include updating the model for Captain Keyes to match that seen in the original Xbox version of Halo, updating Jackal shields so they turn red when damaged, as in the original Halo (this also works with deployable cover), updating Covenant shield doors and the Spirit anti-gravity field to look the same as in the original Halo, and updating the teleporter in multiplayer. Fog effects are now included, too (they were broken for the PC version). And there’s been some work done to the game’s bump maps to include the detail seen on Xbox.
Sources: Halo Waypoint, Generalkidd, Eurogamer