The script of Vaticanus had been completely reinforced, probably around the 10th CE. The reinforcer was careful enough not to enhance text that had been accidently copied twice (dittography).
Dittographies, where the second part is enhanced, had been labeled by the first hand corrector with small ⁽ signs. This allowed the reinforcer to recognize them as dittographies and enhance the second part.

• 1248 C 12 ERGWN corrected in the margin to TEKNWN, Mt 11:19
  
• 1250 B 7 OUK not enhanced (OUK AFEQHSETAI)
  
• 1253 B 15 EIPEN corrected in the margin to LEGEI AUTOIS
  even though AUTOIS is already in the text.
  Reinforcer enhanced LEGEI only
  
• 1253 C 31 EPEI corr. to OTI
  
• 1256 B 30 AITEI corr. to EPIZHTEI, Mt 16:4
  
• 1258 A 26 MOU not enhanced (UION MOU)
  
• 1262 C 28/29 Dittography 2^nd enhanced
  
• 1265 A 19 O NUMFWN corr. to O GAMOS
  
• 1266 A 23 Dittography 1^st enhanced AUTON
  
• 1271 A 31 KAI not enhanced (FAGEIN KAI DIYH...), Mt 25:42
  
• 1273 B 22/23 Dittography 2^nd enhanced
  
• 1291 A 32 Dittography 1^st enhanced EGW
  
• 1292 C 17 R Corr. not enhanced, Mk 10:19, MH APOSTERHSHS
  
• 1305 B 13/14 Dittography 2^nd enhanced
  
• 1308 C 31 L weak correction BASILEIAS for HGEMONIAS, Lk 3:1 (image right)
  
• 1308 C 40 L very weak: THS OREINHS ("hill-country") for THS ITOURAIAS
  
• 1321 C 21 Lk 9:18 SYNHNTHSAN
  
• 1322 A 6 AP(ARNH...)
  
• 1330 B 37 TON TOPON corr. to THN GHN
  
• 1363 B 30 Dittography 1^st enhanced OI
  
• 1366 C 21 Dittography 2^nd enhanced TAUTAUTA Jo 11:11
  
• 1370 C 33-35 Dittography 2^nd enhanced
  
• 1375 C 19/20 Haplography Jo 17:15-16 (KOSMOU) has been corrected
  
• 1375 C 29/30 Dittography 1^st enhanced
  
• 1392 A 40 L Corr. not enhanced, Act 7:42
  EN TH ERHMW left out
  
• 1394 A 3/4 Dittography 1^st enhanced THN ODON
  
• 1409 A 23/24 TITIOU not enhanced (Umlaut, between two lines!)
  ONOMATIIOUCTOU -> ONOMATITITIOUIOUCTOU
  probably wrongly interpreted as a dittography
  
• 1409 B 31 Dittography 1^st enhanced TWNTWN
  
• 1413 C 7 ELEGAN
  has been inadvertantly repeated from an earlier part of the sentence:
  Act 21:4 ELEGAN DIA TON PNEUMATOS ELEGAN MH...
  
• 1420 A 34 ENFANISQHSAN, underlined letters (SQH) not enhanced
  
• 1420 C 18/19 Corr. DE TOU PAULOU -> DE TOUTOU
  
• 1424 A 27 Act 28:1 MELITHNH or MELITINH, NH not enhanced
  
• 1424 B34 Dittography 1^st enhanced Act: 28:8 ..SEUXAMENOS
  
• 1426 A 9/10 THS PISTEWS not enhanced
  
• 1442 C 10 Dittography 1^st enhanced THN THN
  
• 1448 B 16-20 Dittography 2^nd enhanced
  
• 1454 A 30 Dittography 2^nd enhanced small sign ┴ or < in the margin
  
• 1453 B 2 ANAKREI looks not enhanced, evtl. wiped out or faded.
  
• 1472 C 7/8 Dittography 2^nd enhanced PANTASTEGEI
  
• 1474 A 41 MOU not enhanced, (ADELFOI MOU)
  
• 1479 B 33-36 Dittography 2^nd enhanced
  
• 1488 B 5/6 Dittography 2^nd enhanced
  
• 1505 C 18 Dittography 1^st enhanced