I remember reading the rumors way back when about an all out brawl with Spidey, Venom, Sandman and Hob Goblin in a construction yard. Would have been a much more interesting fight if they were all against each other. Then again, what motivation would Sandman have to duke it out with these guys? He just wants money or some such.
Since we have to have our obligatory kidnapping in each film, Venom should have taken his kid and said 'now you work for me.'