The client authentication check on line 337 allows requests with no `client_secret` to bypass secret validation: when `client_secret` is `undefined`, the condition `client.client_secret \!== client_secret && client_secret \!== undefined` evaluates to `true && false` = `false`, skipping the rejection. Since this is demo code with security disclaimers and the AS metadata already advertises `"none"` as a supported auth method, this is a minor inconsistency rather than a critical flaw — but it could

Line 223 is a no-op: `pendingAuthorizations.get(proxyState)\!.scope = \`\${pendingAuthorizations.get(proxyState)\!.scope ?? ''}\`;` just reassigns the scope string to itself via a template literal. This looks like leftover from an incomplete implementation (perhaps something was meant to be appended to the scope). The line should be removed as dead code.

The README run commands on lines 51 and 57 reference `oauthWithoutDCR.ts` (uppercase DCR), but the actual file is `oauthWithoutDcr.ts` (lowercase). On case-sensitive filesystems (Linux), these commands will fail with file-not-found. The same typo appears in the .ts file's own usage comment (line 37).