Certain season 2 episodes do not have subtitles, credits included. I speculate that somewhere along the way, someone figured that the show was going so way downhill that he/she didn't bothered to include in any subtitles anymore. You'll don't see the actor's/actress's name, credits are blank. Even locations are not revealed, though the sound clip for locations comes on.

For the record, all episodes do not have title slides, except for Season 1's "Knight of Shadows".