Dale says that 'anthemis nobilis' is the ingredient in chamomile tea that leads to allergic reactions. Anthemis Nobilis is in fact a strand of chamomile, meaning that Dale said that chamomile is the ingredient in chamomile tea that causes allergic reactions.
When Dale cuts Tucker down from the tree Tuckers hands go out wide to his sides. It is clear that he has all 8 fingers and 2 thumbs, despite the fact that two fingers are supposed to have been cut off.
When the sheriff arrives to question Tucker and Dale at the cabin, Tucker's face is still slightly swollen and covered in Mike's blood. When they go in the cabin to check on Allison, Tucker's face and neck are clean and un-swollen. When they go back outside after the sheriff gets hit with the beam, Tucker is bloody and swollen again.
Dale tells Chuck to check the safety when Chuck is pointing the police officer's gun at Dale and Tucker. Chuck is holding a revolver which does not have a manual safety lever. It is unlikely that Dale's helpful suggestion was actually a clever ploy to kill the young college kid.