I don't have an old tube map to hand, but I think the new one has moved
lines around in the Hackney "Spaghetti Bowl", making it clearer and less
geographically misleading.

Finchley Road and West Hampstead are so close together they look like a
single complex.

When and why did Southwark lose its Arrow Of Indecision with "Waterloo
East" written next to it??

The "London Connections" is green. Obviously the Chiltern service to
Oxford is shown. Greenford is shown as a self-contained shuttle to West
Ealing, even though most of the trains are still running through to
Paddington. London Bridge's relationship with Charing Cross and Cannon
Street has changed.

The London Midland and Southern lines now cross each other just north of
Willesden Junction... Why? Copyright protection, perhaps?
https://en.wikipedia.org/wiki/Trap_street

The Tfl Rail practice of not printing any timetables has spread to the
London Overground. Since the Cheshunt Branch is never much more than
half-hourly, this is disappointing. The Metropolitan Amersham printed
timetable is probably no more as well.