This is the first episode not to show Wyatt, Rufus, or Lucy in the past, although Wyatt and Rufus are seen boarding the Lifeboat at the end of the episode. The only character actually shown in the past is Flynn.
According to Lucy, JFK suffered from ulcers, colitis, and blood infections. Based on recent examination of his medical records, the findings indicated that he suffered from Addison's disease, an auto-immune disorder that attacks the adrenal glands. As a result, he would have suffered from colon inflammation and trouble dealing with stressful situations.
When using facial recognition software to try and find JFK, Jiya comments about Ansel Elgort's resemblance to the young president. In 2017, Elgort was slated to play young JFK in the upcoming feature about his life, Mayday 109.
John F. Kennedy says that his father's number is Gramercy 5934. This phone number format requires further explanation. According to the North American Numbering Plan (NANP), the phone number scheme devised in the 20th century is NPA-NXX-xxxx, where NPA is the area code, NXX is the local exchange, and xxxx is a unique identifier. Around the time of the formation of phone system, there were named exchanges, NXX fragment, so when the operator was given the number GRAmercy 5934, she would focus on the first three letters, and the name of the exchange simply served as mnemonic device for the caller.