Continuity mistake: When Paige walks out to Blake in his car he kisses her. When it cuts his hand is suddenly on her chin. (00:04:55)
Continuity mistake: When Carly locks herself in the truck, the owner throws to the ground the box holding the fan belt and a few other things, right beside the driver's side of the truck. In the next exterior shot, there is nothing on the ground. (00:50:50)
Continuity mistake: When Carly has fallen into the road kill pit, the amount of dirt on her hands keeps changing instantly. (00:20:50)
Continuity mistake: Right at the start, when the woman says, "Why can't you be more like your brother?" the cereal the kid has changes position/amount between shots. (00:02:10)
Continuity mistake: At the beginning of the scene when Paige and Blake are alone in the tent, there is a shot of Blake's cell phone sat atop a CD case, with the top line of the display showing the date and time and "NewVoiceMessage" below it. When the music stops and Blake runs out of the tent, the phone is seen in a different orientation on the CD case but still has the date/time as the top line. After Blake restarts the music, he then picks the phone up, which is still in its new position but no longer has the date/time displayed on the top line. (01:08:10 - 01:09:45)
Answer: It is simply a contraption to keep Wade in place so he doesn't move and the wax can be applied. It's also used to keep the wax out of his eyes, ears, nose and mouth.