Ranko Matasović has provided a list of changes which affected both branches of Insular Celtic but for which there is no evidence that they should be dated to a putative Proto-Insular Celtic period.
Celtic | Celtic F.C. | Languages of India | Indo-European languages | Celtic languages | Slavic languages | Algonquian languages | Turkic languages | Bantu languages | Romance languages | Celtic music | Berber languages | Australian Aboriginal languages | Germanic languages | Celtic cross | Goidelic languages | Arawakan languages | North Germanic languages | Indigenous languages of the Americas | Austroasiatic languages | Indo-Aryan languages | Polynesian languages | Celtic mythology | Northwest Caucasian languages | Munda languages | Mongolic languages | French-based creole languages | Celtic Connections | Songhay languages | Semitic languages |
The Continental Celtic languages are the Celtic languages, now extinct, that were spoken on the continent of Europe, as distinguished from the Insular Celtic languages of the British Isles and Brittany.