With the demo platform, as well as my custom image using a landscape window manager/home screen, sometimes (well, a lot of the time) the Raspberry Pi DSI display has a jittery display that looks like the colors are a little off. HDMI displays also exhibit some corruption (GeChic display shows some small lines of random colors; Chalkboard Electronics 1280x800 display, the picture is pretty much unusable). This doesn't happen at all on any other Linux I've tried (e.g. Raspbian, ChromiumOS), and the video display is fine up until AGL boots, so I don't have any reason to think the display is going bad.

video (DSI display): https://youtu.be/HjAJo2bo1a0