Based on the hint provided and my inspection of the dataset, I have identified a category of issues related to the **Mismatch of record identifiers**. Here are specific issues discovered:

1. **Mismatch between `name` and combined `main_speaker` + `title`**:
    - **Issue**: Incorrect `name` format in records.
    - **Evidence**: In the record for Patricia Ryan, the `name` is "Patricia Ryan: Don't insist on English!" whereas the format expected is "main_speaker: title". The same format issue is observed across various records.
    - **Description**: The `name` field is supposed to concatenate the `main_speaker` and `title` fields in a specific format, but there are instances where this convention is not followed. For example, in one case, the `name` is given as "Patricia Ryan: Don't insist on English!", which follows the format, but discrepancies appear in records such as "The interspecies internet? An idea in progress" where multiple speakers are involved or the title does not follow immediately after the colon, indicating a mismatch in how some records are formatted.

2. **Multiple Speakers without Proper Formatting in `name`**:
    - **Issue**: Inconsistent representation of multiple main speakers in the `name`.
    - **Evidence**: The record with the title "The interspecies internet? An idea in progress" lists multiple speakers ("Diana Reiss, Peter Gabriel, Neil Gershenfeld, and Vince Cerf") but does not format them in the `name` field according to the expected "main_speaker: title" format.
    - **Description**: There is an inconsistency in handling records with multiple main speakers in the dataset. While most records use the format of including the speaker's name followed by a colon and then the title of the talk, this format breaks down in cases where there are multiple speakers, leading to mismatches and potential confusion in record identification.

These issues highlight the need for a standard procedure in naming conventions, especially when dealing with multiple speakers or ensuring the `name` field accurately reflects the combination of `main_speaker` and `title` identifiers.