I dunno if there already is a post for this, but i figured i would start it.
Two that come immediately to mind are:
Some of the music queues in halo cea play the original soundtrack and not the remastered.
Halo 2 anniversary seems to have issues connecting online across two live accounts for co op
An issue that I’ve just encountered:
I tried booting up Halo: Combat Evolved classic. On the options for the missions, on both the music and graphics I toggled them to “Classic” and then hit “Accept Changes” or whatever the accept “button” says exactly. When the game loads up, however, it’s automatically in the remastered graphics and audio.
Still having the issue as above with Halo: Combat Evolved.
Another that I encountered in Halo 3; when piloting the Hornet (using the Universal Zoom & Shoot configuration) my equipment - an Invincibility - was used while lowering the Hornet using LB.