About 4 minutes in, Dean cuts his arm open. The blade starts bleeding before it ever touches his arm.
To avoid being tracked, Sam removes the SIM cards from his and Dean's phones. When he opens the back of his phone you see the card simply lying against a flat plastic panel of the phone chassis. When he opens Dean's the card simply falls out onto the table. It's very obvious neither is plugged into a circuit board making them non-functional.
When Dean cuts his arm with the machete to lure in the vampire, the blood from the cut is visible a split second before he actually cuts himself.
When Dean is working on his car, he asks Sam for a box wrench but, doesn't say what size he needs.
At about 18 minutes in Dean is "sharpening" a machete an an angle which is barely acute, an angle which would destroy the edge.