The most obvious things:
* Aspect ratio is a slightly more open 1.66:1 instead of 1.85:1
* Title card is different (it's larger on the DVD). "Silver Screen Partners IV" credit is also missing from the DVD.
* The stuttering beast is corrected on the DVD (was present in all versions prior to the IMAX re-edit).
I think there's some effect differences also.
Basically, the "OTV" on the DVD is the IMAX cut, re-edited to resemble the OTV - it's not the OTV. Neither is the WIP version on the DVD the same as the laserdisc version.