In the first attack of a rat upon a human, the rat bites the character Duke's hand and then leaps to his neck and face seemingly and bites there. Later on, however, there is no evidence either on his neck or face when he was clearly bitten on one area or the other or both.
Sharpie pen marks are visible underlining various words and sections of the text screen during the opening text crawl.
When Lilith, nude in the sleeping bag is killed by the rat, which enters her through her nether regions and eats it way through her body to exit through her mouth isn't covered in blood. What's shown of the rat (although the head prosthesis is very well done) is dry.