When the 2 cooks (woman and bloke)are at Lloyds and Harrys apartment and read the note that they left for the "Dear gas man...how do they know that I've got gas"? The woman replies "They must have been following us for months".Surely if they're under the impression that Harry and Lloyd are professionals and have been following them for ages, why would the bad guy pretend to be a hitch hiker to get in their dog van? Surely he would think that Harry and Lloyd would recognize him having "followed him for months".