BugsGabriel and Grace both give humorous comments at most objects you see in the game. Though there is a little bug in this - being Grace and looking in the museum of rennes-le-chateau and looking at one of the paintings on the wall in the big museum-hall will give you Gabriel's comment on it.
DevelopmentDean Erickson, who played Gabriel in GK2, was briefly considered to play the role of Gabriel again. But Sierra wanted a more professional actor to play the role and so Tim Curry was chosen to return to the series.
InspirationThe plot around the San Greal Secrets book is partially based on the real 1983 novel Holy Blood, Holy Grail. A controversial work on its own, it returned to the spotlights once again amid plagiarism speculations in the 2003 bestseller The Da Vinci Code.
LegacyGabriel Knight 3: Blood of the Sacred, Blood of the Damned was the last adventure game published by Sierra.
- Grace now has a computer that keeps all the shadow hunter's data and is called SIDNEY. The thing is, that when you enter "Gabriel Knight 4" as a topic of research, you get a ghost story. Jane Jensen affirmed that if GK4 ever gets out, as a book or a game, it will be about ghosts.
- When you look at the chicken who's walking outside the hotel, Gabriel will say something about the voodoo murders from the first Gabriel Knight adventure.
Wal-MartThe game's subtitle "Blood of the Sacred, Blood of the Damned" was removed from the cover of boxes sold at Wal-Mart locations, as per their request.
Information also contributed by Crawly, Ju, just Ju..., Luis Silva, MAT, Picard, Tom Murphy and WildKard