Ok, forget about apple. For the sake of argument, pretend that this is a normal PC which has YOUR graphics card (iris 5100), YOUR latest graphics card driver and is running Windows 8.1. Bluray playback is done by Arcsoft TMT 6 (latest build).
Can you confirm or deny it is normal for it to switch from 1080p 23.976 to 1080p 3D 24 (not 23.976) ?