Actually, E4 did not cut off early. It was only advertised as ending early (at least in Western Canada). If you used PVR you missed the end, but watching live I caught the issue and rebroadcast on CTV Sci-Fi is the correct 1 hour 20 min episode. That said, in my area rebroadcast was only at 2 AM (or 1:45, I forget which) the next morning after original broadcast. So, if you did not realize the issue immediately then yes, you missed out.
But that was a CTV Sci-Fi or a signal provider issue.
[edit for spelling and grammar]