Found 2 records.

Status: Verified (1)

RFC 2049, "Multipurpose Internet Mail Extensions (MIME) Part Five: Conformance Criteria and Examples", November 1996

Errata ID: 3933
Status: Verified
Type: Technical
Publication Format(s) : TEXT
Reported By: Peter Occil
Date Reported: 2014-03-26
Verifier Name: Barry Leiba
Date Verified: 2014-05-07

Section 2 says:

    (10)  Conforming user agents must be able to distinguish
          encoded-words from "text", "ctext", or "word"s,
          according to the rules in section 4, anytime they
          appear in appropriate places in message headers.

It should say:

   (10)  Conforming user agents must be able to distinguish
         encoded-words from "text", "ctext", or "word"s (see the
         grammar in Section 3.3 of [RFC822]), according to
         the recognition rules in Section 6 of [RFC2047],
         any time they appear in appropriate places in
         message headers.

Notes:

Section 4 of RFC 2049 was not the correct citation.

Status: Held for Document Update (1)

RFC 2049, "Multipurpose Internet Mail Extensions (MIME) Part Five: Conformance Criteria and Examples", November 1996

Errata ID: 5470
Status: Held for Document Update
Type: Editorial
Publication Format(s) : TEXT
Reported By: Peter Occil
Date Reported: 2018-08-17
Held for Document Update by: Barry Leiba
Date Held: 2019-04-30

Section 2 says:

    (3)   Must treat any unrecognized Content-Transfer-Encoding
          as if it had a Content-Type of "application/octet-
          stream", regardless of whether or not the actual
          Content-Type is recognized.

It should say:

    (3)   Treat any MIME entity with an unrecognized
          Content-Transfer-Encoding
          as if it had a Content-Type of "application/octet-
          stream", regardless of whether or not the actual
          Content-Type is recognized.

Notes:

The original text spoke of a "Content-Transfer-Encoding" with a "Content-Type", which makes no sense. This paragraph was probably intended instead to apply to MIME entities (messages and body parts).

----- Verifier Notes -----
I think most readers will understand that something like "MIME entity with" was intentionally elided in the existing text, but it's worth recording this for consideration when the spec is revised.

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