Battlefield - S26-E1
Corrected entry: A round of drinks costs £5, which the Doctor pays for with a £5 coin. The £5 coin became legal tender in 1990 but is only minted occasionally in commemorative issues...they are not actually used as currency. (They could be, but as commemorative issues, they are worth more than their face value). After the £1 note was replaced by a coin in 1983, the £5 note was expected to be replaced at any time. Instead, the Bank of England introduced a £2.
Mission to the Unknown - S3-E2
Plot hole: The Daleks announce their secret plan on the city's external loudspeaker system, where Cory hears it. It can hardly be a 'secret' plan if it is broadcast for all to hear...
Castrovalva - S19-E1
The Doctor: That's the trouble with regeneration, you never quite know what you're going to get. (00:12:15)
Planet of the Spiders - S11-E5
Trivia: The first thing the Third Doctor does on-screen is collapse out of the TARDIS, which is also the last thing he does in that incarnation.
Question: If the Doctor gets a TARDIS, does that mean other Timelords get a TARDIS as well?
Answer: TARDISes are generally available for properly authorised use on Gallifrey; they're not usually assigned to a particular Timelord on a long-term basis. The Doctor stole his when he left his homeworld.
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Correction: This may be well and true, however this all happened after the show was cancelled (in 1989). You can't really call this a mistake just because the writers failed to predict the future.