On the occassions I have seen it they have even mentioned Top Gear
Interesting thing. Way back when this current style of Top Gear was in it's first series (few years ago now), there was this little 'cryptic, but not so cryptic' thing that was going on between the shows. Clarkson was driving and said something like "but when you change from 5th Gear to Top Gear, everything goes mental..." I watched it and thought "yer cheeky bastard"
. Next 5th Gear episode, that posh bloke who used to be on 5th Gear (forget his name) was doing a car test and said "Sure Top Gear may well be fast, but everything changes when you slip down to 5th Gear" and he sped off.
At the time I told my mate and he didn't notice it. But aparently Clarkson said that it was a 'thing' they were doing between the 2 shows when he was on a chat show.