The Ministry of Time's HQ is on the abandoned Palace of Sueca, Duque de Alba Square, Madrid.
According to series creator Javier Olivares, their main influences were the novel "The Gates of Anubis" by Tim Powers and the film Time After Time (1979), a personal favorite of his.
When the second season went to a hiatus, many fans feared the series was on the verge of cancellation. The hiatus was actually requested by show-runner Javier Olivares who had envisioned the season as two clearly separated halves, with a special a la UK series like Doctor Who (2005) or Downton Abbey (2010) linking both halves. The network refused to produce the special, but granted the hiatus. They just neglected to tell the audience, so Olivares himself had to set the record straight and clear fans fears in interviews.
The doorman of the ministry is a big fan of Atlético de Madrid football club. This is an homage to co-creator Pablo Olivares, who died while making the first season.