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* TwentyMinutesIntoTheFuture: When the book was written, the 70s were twenty minutes away, but then Heinlein jumped it another twenty minutes into the early 21st century.
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* TwentyMinutesIntoTheFuture: When the book was written, the 70s were twenty minutes away, but then Heinlein jumped it another twenty minutes into the early 21st century.
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* WriteBackToTheFuture
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* ItsForABook: When Dan talks to Dr. Twitchell he claims to be doing research for a book called ''Unsung Geniuses''.
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* ItsForABook: When Dan talks to Dr. Twitchell he claims to be doing research for a book called ''Unsung Geniuses''.
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* GoodPeopleHaveGoodSex: The Suttons, the only trustworthy business partners Daniel found. They share Heinlein's views on nudism.
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* TimeTravelTenseTrouble:
-->Then I caught hold of myself and realized that, out of all the persons living in 1970, [Dr. Twitchell] was the one I had least need to worry about. Nothing could go wrong because nothing had ... I meant "nothing would." No--- Then I quit trying to phrase it, realizing that if time travel ever became widespread, English grammar was going to have to add a whole new set of tenses to describe reflexive situations-- conjugations that would make the French literary tenses and the Latin historical tenses look simple.
-->Then I caught hold of myself and realized that, out of all the persons living in 1970, [Dr. Twitchell] was the one I had least need to worry about. Nothing could go wrong because nothing had ... I meant "nothing would." No--- Then I quit trying to phrase it, realizing that if time travel ever became widespread, English grammar was going to have to add a whole new set of tenses to describe reflexive situations-- conjugations that would make the French literary tenses and the Latin historical tenses look simple.
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* ItsForABook: When Dan talks to Dr. Twitchell he claims to be doing research for a book called ''Unsung Geniuses''.
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* BeethovenWasAnAlienSpy: [[spoiler:Either Creator/LeonardoDaVinci or Quetzalcoatl or both may have been a time traveler Leonard Vincent.]]
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* BeethovenWasAnAlienSpy: [[spoiler:Either Creator/LeonardoDaVinci or Quetzalcoatl or both may have been a time traveler Leonard Vincent.]]]]
* BlackmailIsSuchAnUglyWord:
-->'''Dan:''' Well, first, which one of you cooked up the swindle? Or did you plan it together?\\
'''Miles:''' That's an ugly word, Dan. I don't like it.
* BlackmailIsSuchAnUglyWord:
-->'''Dan:''' Well, first, which one of you cooked up the swindle? Or did you plan it together?\\
'''Miles:''' That's an ugly word, Dan. I don't like it.
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** Leonard Vincent didn't like his 1980s and wanted to travel very far to the past or future. [[spoiler:We never learn if he ended up in 1480s or 2480s and if he was happy there.]]
* CompoundInterestTimeTravelGambit: Cold sleep is advertised for that. The danger of managing company going bankrupt is never mentioned to clients.
* CompoundInterestTimeTravelGambit: Cold sleep is advertised for that. The danger of managing company going bankrupt is never mentioned to clients.
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** Leonard Vincent didn't like his the 1980s and wanted to travel very far to the past or future. [[spoiler:We never learn if he ended up in the 1480s or 2480s and if he was happy there.]]
* CompoundInterestTimeTravelGambit: Cold sleep is advertised for that. The danger of the managing company going bankrupt is never mentioned to clients.
* CompoundInterestTimeTravelGambit: Cold sleep is advertised for that. The danger of the managing company going bankrupt is never mentioned to clients.
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* MeaningfulName: Belle S. Darkin. Belle = beautiful; Darkin = darkly figure who should not have been trusted.
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* MeaningfulName: Belle S. Darkin. Belle = beautiful; Darkin = darkly dark figure who should not have been trusted.
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* SingleTaskRobot: Davis initially invents several of these, starting with Hired Girl (an automated floor cleaner) and later including Drafting Dan (an automated drafting table), before moving on to Flexible Frank (a more multi-purpose robot).
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In 2021 this film was adopted into a Japanese film, ''Film/TheDoorIntoSummer'', which, except for a SettingUpdate, is pretty faithful to the plot.
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* TitledAfterTheSong: {{Inverted}}. Music/TheMonkees did a song named after this book.
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* TitledAfterTheSong: {{Inverted}}. InvertedTrope. Music/TheMonkees did [[Music/PiscesAquariusCapricornAndJonesLtd a song song]] named after this book.
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* AppliedPhlebotinum: The Thorston memory tubes Davis plugs into his robots. Basically, in the absence of personal computers, functional and autonomous robots capable of even a single task (like washing the dishes or vacuuming) were beyond even imagining, so Heinlein came up with the minimum phlebotinum necessary to make them possible: a memory device that would allow the robot to perform a rote task once it's been walked through it.
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* AppliedPhlebotinum: The Thorston memory tubes Davis plugs into his robots. Probably, inspired by [[https://en.wikipedia.org/wiki/Williams_tube Williams–Kilburn tube]], the earliest RAM device. Basically, in the absence of personal computers, functional and autonomous robots capable of even a single task (like washing the dishes or vacuuming) were beyond even imagining, so Heinlein came up with the minimum phlebotinum necessary to make them possible: a memory device that would allow the robot to perform a rote task once it's been walked through it.
