Going through the export_descr_unit.txt netted the following oddities:

- African elephants appear to have the defense scores for the crew and animal swapped. See:
Code:
;487
type             african elephant forest
dictionary       african_elephant_forest      ; African Forest Elephants
---
stat_pri_armour  15, 20, 0, leather
stat_sec_armour  8, 15, leather

;129
type             african elephant forest towered
dictionary       african_elephant_forest_towered      ; Towered African Forest Elephants
---
stat_pri_armour  15, 20, 0, leather
stat_sec_armour  10, 15, leather

;127
type             african elephant bush
dictionary       african_elephant_bush      ; African Bush Elephants
---
stat_pri_armour  17, 22, 0, flesh
stat_sec_armour  10, 15, leather
Oddly, these are even in the unit cards. For the sake of comparision, the Indian ones seem to have them in the proper order:
Spoiler Alert, click show to read: 
;131
type indian elephant armored
dictionary indian_elephant_armored ; Armored Indian Elephants
---
stat_pri_armour 8, 12, 0, metal
stat_sec_armour 20, 22, flesh

;130
type indian elephant standard
dictionary indian_elephant_standard ; Indian Elephants
---
stat_pri_armour 8, 12, 0, metal
stat_sec_armour 16, 20, flesh


- Klerouchoi Agema Hippeis (#161) appear to be missing the AP attribute for their secondary kopis swords.

- Sarmatian nobles ("Ragon Sauromatae Uaezdaettae", #110) have weird values for their secondary weapon; attack delay 55 and lethality 0.33, when two-handed lances normally have either 180/0.38 (xyston) or 200/0.4 (kontos, which is presumably what these fellows use).

- The Dacian bodyguard unit (Phylakes Daoi, #427) seem to be missing their shield value (unless both the skin and unit card are actually out of date and they no longer carry one; I should probably actually check the matter in-game...). It is also possible they and/or the Tarabostes (#332) are missing AP attribute for the secondary weapon, depending on what kind of sword they in fact use; particularly given the oddly low base secondary attack value of the Phylakes (as above, I should actually check this...).