Easter egg: On the 'choose their fate' version of the movie, straight after Ashlyn says 'oh a few degrees won't hurt' you get asked which temperature she should change it to (73 degrees or 76 degrees) if you choose 76 degrees, you see Ashlyn and Ashley's alternate death. Instead of being incinerated, the pair are electrocuted, as Ashlyn manages to get out of her tanning bed before the wood shelf jams the pair in, instead she is hit in the head (and knocked unconscious) by the wooden shelf. She later awakens, frees the wood from Ashley's bed, and quotes "I got you" and grabs Ashley's hand, but the glass of the bed underneath Ashley breaks, and she falls into the wiring of the tanning bed, electrocuting them both.
Easter egg: If you choose the DVD option which allows you to pick who dies, pick tails on the first coin flip and all of the characters survive.
Chosen answer: It's metioned in the filmakers' commentary that in every Final Destination movie everyone has a premonition (Of course), well it's also mentioned by the director, James Wong, that if death wants to kill them why give them the premonition in the first place? Well he believes that there is some other force out there trying to prevent death from killing these teenagers. That's where the premonitions come in including the signs therefore, Wendy's pictures are helping signs like voices or visions from other movies. It's just the whole "giving signs" thing is portrayed differently in this movie.