In 1990, then newly-founded Trimark Pictures bought the distribution rights from the bankrupt New World Pictures and also purchased the rights for any potential sequels.
The film was originally completed in late 1988 and was one of the last films completed by distributor New World Pictures when they filed for Chapter 11 bankruptcy. The film's trailer was actually shown before early 1989 theatrical releases. Instead of going direct to video, Warlock was picked up and released in theatres by Trimark Pictures in 1991. Its box office success lead to a sequel, "Warlock: The Armageddon" in which Trimark also released theatrically.
Following the death of the medium, the Warlock is on the other side of the table and squatting down. The chair on the right side of the screen is still visible.
Redferne's grave would not have appeared in present day, for he fell through the time warp with the Warlock, therefore he was still alive. Redferne travels back to his own time at the end of the film, in fact the swirling vortex that appears round him after he kisses Kassandra dissipates over his gravestone.
Warlock: [placing a hex on Kassandra]
Tout, Tout, through and about; your callow life in dismay. Rentum, Osculum, Tormentum: a decade twice over a day.
What are the differences between the British VHS Version and the Uncensored Version?
A
In the UK and in the Netherlands a slightly censored version was released on VHS that misses approx. 45 seconds in comparison to the Original Version and features 4 alternate sequences, as well. A detailed comparison between both versions with pictures can be found here.