I was building a Hobbit hole in Creative mode and wanted some fancy torchholders, Putting an item frame up and a block inside revealed overlapping, glitched textures when viewing in the Super Secret Filters of the latest snapshots.
Environment
Java Version 7 Update 40, Windows 7 64 bit OS, Intel(R) Core(TM) i7-2620M CPU @ 2.70GHz
Please attach a screenshot, and please state which filter you were using.