Saw IV

The seamless transitions between separate scenes in the film were not created using digital effects, but were done practically. For these transitions, the sets were built in such a way that two separate scenes could be filmed in one shot without interruption.

(at around 3 mins) During Jigsaw's autopsy, his brain is easily removed from the skull, with no connection to the brain stem or spinal cord. In reality, dissection is needed to remove the brain.

Even though the German theatrical version is rated "Not under 18", it was cut by 55 seconds (it is based on the U.S. R-rated version). Since there are different rating standards for theatrical and home video releases, this rating was denied for the DVD release. The theatrical version was therefore released on DVD with a SPIO/JK approval. Additionally, another version (with scenes cut) with a "Not under 18" rating was released as well. As with Saw III (2006) the U.S. unrated version was released as well; however, it wasn't released in Germany, which allowed it to avoid potential legal problems with German judiciary.

Edited into Saw V (2008)