I have to go soon to my class I have today, but I was able to open it fine in MS Gif Animator without any problems I think; and if in that I wanted to remove the "No More Heroes" from the animation, I would just remove the last few frames.
I once opened a Gif file though that wasn't animated a long time ago and for some reason the image stretched taller when I did so even though the preview showed it fine - and it was fine unless I edited it. I guess Gif files have issues.