So that more or less completes it for me.
However, I have 78 stations, so we need to lose three. We can get rid of Gunnersbury, because it's covered by Arsenal. Dunno about the other two though.
1 - Elephant & Castle
2 - Angel
3 - Chalk Farm
4 - Swiss Cottage
5 - Marble Arch
6 - Redbridge
7 - Temple
8 - Finsbury Park
9 - Knightsbridge
10 - Lancaster Gate
11 - Bow Road
12 - Arsenal (see 64)
13 - Monument
14 - Shepherd's Bush
15 - Blackhorse Road
16 - Limehouse
17 - West Ham
18 - East Ham (whichever way round you like)
19 - Oval
20 - Seven Sisters
21 - Tower Hill
22 - Green Park
23 - Cyprus
24 - Barking
25 - Canada Water
26 - Aldgate (old gate)
27 - New Cross
28 - Hatton Cross
29 - Whitechapel
30 - Archway
31 - Royal Oak
32 - Snaresbrook (Snare's broke)
33 - Blackfriars
34 - High Barnet
35 - Warren Street
36 - Becontree (Beak on tree, although I thought it was pronounced Beckon-tree)
37 - Bank
38 - Pinner
39 - Lambeth North
40 - Hammersmith
41 - Leytonstone
42 - Waterloo
43 - Preston Road
44 - King's Cross
45 - Marylebone (Marry le bone)
46 - Wood Green
47a - Cannon Street
47b - Highgate
48 - Covent Garden
49 - Baker Street
50 - White City
51 - Mansion House
52 - Barbican
53 - Kew Gardens
54 - Brixton
55 - Queensway
56 - Kilburn
57 - Turnham Green
58 - Balham
59 - Upney ("up knee" - a bit tenuous, and I'm not sure it's right, but it sounds good)
60 - Leicester Square (a square of Red Leicester cheese!)
61 - Stockwell (not sure what the white thing is in place of the bucket, but it's a well ...)
62 - Victoria (Victoria sponge?)
63 - Westminster (it may not be intended, but he put it on the sign)
64 - Gunnersbury (this is what I first thought when I saw this. Someone is "buried" in a tomb near some guns)
65 - Bounds Green (bound screen)
66 - Forest Hill
67 - Holburn
68 - Mill Hill East (It's a mill on a hill, but nothing suggests the "east" bit)
69 - Mile End (not sure where the "end" comes from)
70 - Mudchute
71 - Brent Cross (bent cross? This one is a bit tenuous too)
72 - Maida Vale
73 - Burnt Oak
74 - Hainault
75 - Bayswater
76 - Bond Street
77 - Parsons Green
78 - Hampstead