* In the novel, Dave Bowman's attempts to track down his former girlfriend lead to a computer error that sends a check for ''$1.00'' to everyone in Florida whose last name starts with the letter 'F'.
* Heywood and Curnow, talking about the things they miss back on earth.
* Chandra telling Heywood and Curnow about [[spoiler:deactivating their "kill switch" for HAL, should he go rogue again.]] The looks on their faces ''screamed'' "...you bastard".
** The last second grin Heywood shoots Chandra afterward borders on a HeartwarmingMoment.
* In the novel, the fact that both crews were fluent in both Russian and English led to some amusing situations, such as the three Americans realizing that they had been idly chatting in Russian for nearly 30 minutes at one point or conversations among them all changing language in mid conversation. One result was the 'Stamp out Russlish' campaign, which was meant as a morale booster through humor than anything else.
* "Look! A flying saucer! Who's got a camera?!"
* HAL has just delivered a message to Floyd, with the WhamLine that the sender had identified as "I was David Bowman."
-->'''HAL 9000:''' Do you want me to repeat the last response?
-->'''Dr. Heywood Floyd:''' [{{beat}}] No, no. Tell Curnow that this is no time for jokes.
* The film showing an issue of Time magazine with a cover drawing depicting Creator/ArthurCClarke and Creator/StanleyKubrick as the US President and Russian Premier, respectively.
* Meta example: after the release of 2001, people began to notice that HAL's name just happened to be one letter removed from the name of a certain American computer company, and soon speculation was rampant that HAL was a subtle [[TakeThat Take That]] at IBM.[[note]]The name was nothing more than a coincidence. IBM had provided a lot of technical assistance to both the novel and film, and Clarke went on record saying that he would've changed HAL's name if he'd caught onto it.[[/note]] In the 2010 novel, Dr. Chandra addresses this, and you can practically feel Clarke's frustration pouring through the words.
-->'''Chandra''': Utter nonsense!...I thought that by now every intelligent person knew that H-A-L is derived from ''Heuristic [=ALgorithmic=]''.
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