- Compilation Movie: While this originally aired as two 75-minute episodes, it's presented on the DVD as a single 145-minute feature.
- Dawson Casting: Fifty-nine year old Bob Hoskins as forty-five year old Professor Challenger.
- Fake Nationality: The English Bob Hoskins as the Scottish Professor Challenger.
- Underage Casting: Thirty-one year old Tom Ward as Lord Roxton, who is in his mid-forties.
- Prop Recycling: Many of the extinct animal models were reused and slightly tweaked from the first two entries of the Walking With... series.
- What Could Have Been: BRIAN BLESSED was considered for the role of Challenger but this was vetoed by BBC America.
Trivia / The Lost World (2001)