Accent Depundent: The case set in medieval England features an instance of the feudal/futile pun, which only works with an American accent.
Dated History: The manual states Mona the model in the Leonardo da Vinci mission was a fictional character and the inspiration for the painting, let alone whether or not Leonardo actually used a model for the creation of The Mona Lisa, was (at the time) unknown. In 2005, it was discovered that the Mona Lisa depicts Lisa del Giocondo, meaning the game was actually right to depict her as a real person (note that the "Mona" is a title, not part of her name — "Mona Lisa" is the Italian equivalent of "Madam Lisa"). Of course, the depiction of her as a surly model posing for Leonardo is still completely fanciful, especially considering he spent years working on it.
Overlapping with Missing Episode: One case was apparently deleted very early in development that would have been set between the Egypt and Rome cases. It's speculated this case would have featured Dee Cryption since she's the only thief who's involved in one theft in the entire game (and is busted out of jail without having been sent there in the first place), whereas everyone else (including Carmen, since she has a significant presence in the USSR case and is the target of the final case) is involved in two cases. It's also speculated that the good guide would've been Polly Tix, due to her having a measly two cases compared to the other guides.
Role Reprise: This game features actors from the Where In Time Is Carmen Sandiego game show, most obviously Lynne Thigpen as the Chief. Additionally, the crooks reprised from the show are voiced by the same actors who played them there. Carmen herself is voiced by Brenda Burke, who played her in the game show's second season.
One third (six out of eighteen) of the cases takes place between 1450 and 1600, roughly corresponding to The Renaissance. This is the largest number of cases clustered so close to each other in time.
The Middle Ages (c. 500 - 1500) is the most represented historical era in the game, covering cases three through ten.
When you hover your cursor over a character you can speak to, the text that appears normally reads, "Talk to [character name]". When you do this with Julius Caesar, however, the text reads, "Hail Caesar".
The game takes you from 1490 B.C.E. to 1961, covering a span of 3,451 years. However, under 17% of the game represents over 72% of that time span.
very early in development that would have been set between the Egypt and Rome cases. It's speculated this case would have featured Dee Cryption since she's the only thief who's involved in one theft in the entire game (and is busted out of jail without having been sent there in the first place), whereas everyone else (including Carmen, since she has a significant presence in the USSR case and is the target of the final case) is involved in two cases. It's also speculated that the good guide would've been Polly Tix, due to her having a measly two cases compared to the other guides.