I'll start with a few from the old Elim Garak Obsidian Order pages, but I suspect it's a woefully incomplete list now.
- Displayed firepower too low:
- X-Wing: Krytos Trap
- X-Wing: The Bacta War
- X-Wing: Isard's Revenge
- X-Wing: Solo Command
- Showdown at Centerpoint
- Darksaber
- Star Wars Rebellion #10
- Heir to the Empire comic book
- Star Wars: Empire #35
- Star Wars: Legacy #17
- Coruscant and the Core Worlds (Caamas details)
- Allegiance
- Dark Apprentice
- Vector Prime
- Inferno
- Cutscenes from KotOR
- Displayed FTL speeds too low:
- Tyrant's Test
- Heir to the Empire
- Displayed STL speeds too low:
- Vector Prime
- Contradicts fighter/capital ship firepower relationship:
- X-Wing: Isard's Revenge
- X-Wing: The Bacta War
- The Hutt Gambit
- Dark Force Rising
- Legacy of the Force: Betrayal
- Shadows of the Empire: Evolution
- Mandatory Retirement
- Phantom Affair
- Implicitly places firepower too low via comparison with targets/superweapons
- Tyrant's Test
- Vector Prime
- Dark Empire Sourcebook
- New Essential Guide to Vehicles and Weapons
- Death Star
- Tales of the Bounty Hunters (asteroids vs. bounty hunter guns)
- Places a fusion/fission generator as the power source for a ship competitive in warfare, or otherwise causes problems for hypermatter reactors:
- The Truce at Bakura
- Star Wars Sourcebook
- Star Wars Roleplaying Game: Saga Edition
- Rogue Planet (Death Star concept to use ice asteroids for fuel)
- Weapons range:
- X-Wing: Isard's Revenge
- X-Wing: The Bacta War
- X-Wing: The Krytos Trap
- X-Wing: Solo Command
- Tyrant's Test
- Misc. other contradictions:
- Shields too weak vs sun - "Heir to the Empire"
- Cables used to transmit power - "Vision of the Future"
- Implicit contradiction of army sizes via the number of clones - "Guide to the Grand Army of the Republic," Republic Commando books, Odds
- Fuel consumption mismatch - SWRPG.
- NJO: Star by Star - Vong cruiser blown up by 1,000 kg baradium warhead.
- Titanium hull plating in Rogue Squadron.
- Star Wars Technical Journal #2 provides a rare explicit yield figure which can't fit with the ICS - kiloton protons.