One of the Alien suits in BDE were borrowed (if I remember correctly) from a guy that owned a screen-used one. Also, the director is an artist who used to work for Stan Winston Studios (and therefore had access to copies of the studio molds for certain parts. The rest they sculpted themselves).
....and if you didn't know, the Joker was played by "Boner" from the 80s TV show 'Growing Pains'...the real life son of Chekov from Star Trek.