I'm not sure what the judge meant by "show trial." What did he expect? Simpson was a big celebrity and the murder was bloody and lent itself to sensational publicity. Also, OJ had plenty of money to hire several high-priced lawyers, including Alan Dershowitz from Harvard Law School. However, as I think about the judge's comment I don't think Simpson's trial fit the usual definition of a show trial which usually has referred to trials of dissidents in Stalinist Russia or Maoist China, not criminal trials of celebrities in democratic countries.