so, 15x18 was really something. Shame they couldn't film the last 2 episodes...
The clips are all in chronological order as follows:
0:00 4x01
0:11-0:42 4x07
0:42-0:58 4x10
0:58-1:56 4x16
1:56-2:12 4x20
2:12-2:56 4x22
2:56-3:04 5x02
3:04-6:00 5x03
6:00-6:42 5x04
6:42-6:54 5x14
6:54-7:19 5x18
7:19-7:36 6x03
7:36-7:42 6x17
7:42-8:15 6x19
8:15-9:16 6x20
9:16-9:47 6x21
9:47-10:10 7x01
10:10-10:36 7x23
10:36-11:26 8x02
11:26-11:40 8x07
11:40-13:18 8x17
13:18-13:38 8x18
13:38-13:48 8x19
13:48-13:51 8x20
13:51-14:05 8x22
14:05-14:38 8x23