Amongst the more interesting things I have noted over many years of observing Piccadilly have been, on realising a Pendolino cab is sitting closer to the signal than normal, finding on the blocks a 323 with a 9 car Pendolino on top, and on another occasion a 156 with 11 car Pendo on top! Obviously these in the longer platforms. An interesting experience for the inward 390 driver to be faced with 'cats eyes' into an occupied platform!
Also, in another context, the screen in one of the terminal platforms displaying a departure (albeit cancelled) to Blackpool, this on occasions when a Hazel Grove - Blackpool is being terminated short and re-platformed into the shed, but 'the system' still has it as a Blackpool train although cancelled forward from Piccadilly.