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- Velázquez is seen reading a book on Picasso. He gets to meet him in episode 5.
- Salvador negates emphatically that a time machine can exist, only time doors. This just presages the apparition of the American time travellers in Episode 5, who do use a time machine.
- Salvador tells Julián about the discoverer of the time doors, a Jewish rabbi that shared his knowledge with Queen Isabel in exchange for not being expelled, but that was later burned by the Inquisition for witchcraft. Saving said rabbi is the mission of Episode 4.
- The Clerk talks about using a door to watch the same football match 40 times. This seems a continuity error until "time loop doors" are explained in detail in Episode 4.
- Ernesto discusses the perils of catching a disease in the past. In Episode 13, a strain of the Spanish Flu is released in the present day Ministry's HQ.
- Julián quotes a song by early 80s rock band Leño. In Episode 5, he takes Amelia to a Leño concert in 1981 and buys a record of them, which earns him a scolding for taking it to the present.
- Julián scolds Amelia for having unprotected sex in a different time, asking how she'd explain it if she becomes pregnant. In the season finale (Episode 8), it is revealed that she'll have a daughter in the next four years, and there is a strong implication that her (initially fake) engagement to Julián will be used to hide the child's real paternity.
- Salvador describes the reign of Philip II as a golden age of the Ministry of Time ("maybe the only one"). Season 2 ends with Philip II himself deciding to overrule the Ministry of Time's rules and using it to go back in time to successfully invade England.
- Velázquez mentions that he never painted The Surrender of Breda (in its current state), one of whose characters is General Ambrogio Spinola. Spinola himself leads the liberation of the Ministry.
- Julián tells Amelia's parents (in 1880) that he can't see them (or their daughter) for a while because he is going to serve in the war in Cuba. In Season 2, Julián goes on a solo mission in the Spanish-American War, and disappears from the series for five episodes.
- Alonso converses with a Medieval agent about El Cid's last victory when he was already dead. In episode 9, Alonso must make sure that this victory happens.
- Julián sees Irene pointing a gun at him. She's actually aiming at an attacker behind his back, but Irene becomes the enemy in Episode 8.
- Leiva tells Salvador that he won't kill him because he saved his life once. The next episode, Salvador reveals that it was him who helped Leiva fake his death so he could escape from the Medieval castle.
- At the beginning, the patrol returns from an off-screen mission to Philip V's reign. Philip V appears as a main character in Episode 17.
- Jordi Hurtado talks about his past mission ensuring that Don Quixote's manuscript was finished. In Episode 11, the mission is getting Don Quixote published... and Hurtado's past mission becomes futile, because Cervantes must write the book from scratch after selling the original.
- Julián reads Lorca's Poet in New York while jumping in and out of a mission in 1924. In Episode 14, the mission includes visiting New York in 1924.
- Pacino travels to the present while Adolfo Suárez is announcing his resignation on TV. In Episode 12, the mission is to save Suárez's ancestor.
- Paul Walcott seems to have a rather unrelated nosebleed when halted by Pacino and Alonso... That turns out to be a Deadly Nosebleed caused by Darrow's time machine leaking nuclear radiation to its users, and thus killing him six episodes later. This jumpstarts the end of Darrow.