Continuity error

In Terminator fictions, a continuity error happens when there is inconsistency between a fiction and its previous instalment(s).

John Connor was 10-year-old in the film Terminator 2: Judgment Day. However, in Terminator 3: Rise of the Machines, John Connor claim he was attacked by the T-1000 when he was 13 years old.
The events in T2 are set in 1995, however, it was referred in 1991 by T3 novel, 1994 by Terminator 2: The New John Connor Chronicles and T3, and 1997 by Terminator: The Sarah Connor Chronicles.
John Connor's birthday is 28 February 1985 as shown in T2. However, in Terminator: The Sarah Connor Chronicles, John Connor's birthday is 14 November instead.^[1]
Judgment Day in Terminator Salvation franchise happens in 2004 according to some novels, while in others, it is 2003 when the incident happens.
Although the opening scene of Terminator: Dark Fate takes place in 1998, John Connor does not seem to have aged nearly as much as he should have, as he still looks the same as he did in 1995 in Terminator 2: Judgment Day. However, it should be noted that although John would be 13 at this point, Edward Furlong was 13 when filming T2.

Notes[]

Note that some inconsistencies may not be continuity error as they are part of the story or setting to show the timeline is changed due to time travelling mission(s). For example, in Rise of the Machines timeline, Terminators are developed by Cyber Research Systems instead of Cyberdyne Systems due to the destruction of Cyberdyne Building. Another example is that the T-600 is a Terminator of average-human size, while in Salvation timeline, the T-600 becomes a hulking machine in excess of 7'3"-tall.