The 7/4 time signature is briefly used at the end of the of the song and was probably a funny experimental moment for the band when in the studio. As with most songs, you can count 1, 2, 3, 4 over and over again for this song, but fast forward the studio version of the song to the 3:54 time mark and listen the last section. To better understand the time signature it's easier to count 1, 2, 3, 4, 5, 6, 7, 8 then 1, 2, 3, 4, 5, 6, 7 then repeat 8 counts again, then 7 counts. If you don't stop at 7 on the 3rd measures, you'll lose the beat. The 7 count measures are the 7/4 moments.
When you watch that song live they run the ending a lot longer so you can get used to the repeating 8 & 7 counts as the time signature changes. Once you understand the timing, it's easier to follow the ending.
Here's a link where I put the counts over the live video:
https://dl.dropboxusercontent.com/u/...ng%207%3A4.mov