No longer true...
There are 12 London Underground lines. No longer true. There are now 11, and will be for the foreseeable future. When the East London line reopens in 2010 it'll be part of the London Overground, not the Underground network.
The Underground has 274 stations. No longer true. There are now 268. Today we've lost Wapping, Rotherhithe and Surrey Quays, which now exist only as replacement bus service stops. We've lost New Cross and New Cross Gate, which now exist only as National Rail stations. And we've lost Shadwell, which is now only on the DLR (which isn't a London Underground line, as any fule know). The Underground runs over 253 miles (408km) of line. No longer true. Now it's 248 miles (400km)... plus four particularly useless replacement bus services.
The East London Line is the only line without a station in Zone 1. No longer true. All the remaining lines do.
Five London boroughs are not served by the London Underground. No longer true. Today Lewisham joins that list to make six, along with Bexley, Bromley, Croydon, Sutton and Kingston.
The Jubilee line is the only Underground route that connects with all others. No longer true. (I wonder how long it'll take the O2 website to change this one. Ages probably, given the number of other howlers on the same page). Let's work this one out. Any line which connects with all others must connect with the Waterloo & City line. So we're only interested in lines that pass through either Waterloo or Bank. Through Waterloo we have the Jubilee, Northern and Bakerloo (all of which link up). And through Bank we have the Central (which also links) plus maybe the Circle (if we're allowed to treat Bank/Monument as one station, which TfL increasingly do). But we can't have the District, because that just misses the Metropolitan by a few metres (at Aldgate). So the newly-updated statement should be "The Jubilee, Northern, Bakerloo, Central and Circle lines are the only Underground routes that connect with all others." Which just isn't interesting any more, sorry.
The Thames Tunnel is the oldest section of tunnel in the London Underground. No longer true. Now the oldest is along the original Metropolitan railway tunnel between Paddington and Farringdon, opened 1863. Probably. Unless you know better.
Wapping is the only station which has no letters in common with the word 'lobster'. No longer true. Now every Underground station shares at least one letter with the word 'lobster'. Is nothing sacred?