diff --git a/telethon/extensions/html.py b/telethon/extensions/html.py
index 1bdfe177..ef5e8a34 100644
--- a/telethon/extensions/html.py
+++ b/telethon/extensions/html.py
@@ -126,7 +126,7 @@ def parse(html: str) -> Tuple[str, List[TypeMessageEntity]]:
     Parses the given HTML message and returns its stripped representation
     plus a list of the MessageEntity's that were found.
 
-    :param message: the message with HTML to be parsed.
+    :param html: the message with HTML to be parsed.
     :return: a tuple consisting of (clean message, [message entities]).
     """
     if not html:
diff --git a/telethon/network/connection/connection.py b/telethon/network/connection/connection.py
index 27869eda..bd1fde8a 100644
--- a/telethon/network/connection/connection.py
+++ b/telethon/network/connection/connection.py
@@ -254,7 +254,7 @@ class PacketCodec(abc.ABC):
 
     """
     This attribute should be re-defined by subclass to define if some
-    "magic bytes" should be sent to server right after conection is made to
+    "magic bytes" should be sent to server right after connection is made to
     signal which protocol will be used
     """
     tag = None
diff --git a/telethon/network/connection/tcpobfuscated.py b/telethon/network/connection/tcpobfuscated.py
index 6cc10094..cf2e6af5 100644
--- a/telethon/network/connection/tcpobfuscated.py
+++ b/telethon/network/connection/tcpobfuscated.py
@@ -25,7 +25,7 @@ class ObfuscatedIO:
             random = os.urandom(64)
             if (random[0] != 0xef and
                     random[:4] not in keywords and
-                    random[4:4] != b'\0\0\0\0'):
+                    random[4:8] != b'\0\0\0\0'):
                 break
 
         random = bytearray(random)
diff --git a/telethon/tl/custom/adminlogevent.py b/telethon/tl/custom/adminlogevent.py
index 930102f8..a1744017 100644
--- a/telethon/tl/custom/adminlogevent.py
+++ b/telethon/tl/custom/adminlogevent.py
@@ -39,7 +39,7 @@ class AdminLogEvent:
     @property
     def date(self):
         """
-        The date when this event occured.
+        The date when this event occurred.
         """
         return self.original.date