diff --git a/README.md b/README.md
index 3551f26..1fab416 100644
--- a/README.md
+++ b/README.md
@@ -21,7 +21,7 @@ which implements the [Generic JSON RPC](https://github.com/ethereum/wiki/wiki/JS
 
 <!-- [![browser support](https://ci.testling.com/ethereum/ethereum.js.png)](https://ci.testling.com/ethereum/ethereum.js) -->
 
-You need to run a local ethrereum node to use this library.
+You need to run a local Ethereum node to use this library.
 
 [Documentation](https://github.com/ethereum/wiki/wiki/JavaScript-API)
 
diff --git a/lib/web3/filter.js b/lib/web3/filter.js
index 3e4628e..5db6734 100644
--- a/lib/web3/filter.js
+++ b/lib/web3/filter.js
@@ -53,7 +53,7 @@ var getOptions = function (options) {
 
     if (utils.isString(options)) {
         return options;
-    } 
+    }
 
     options = options || {};
 
@@ -69,8 +69,8 @@ var getOptions = function (options) {
         to: options.to,
         address: options.address,
         fromBlock: formatters.inputBlockNumberFormatter(options.fromBlock),
-        toBlock: formatters.inputBlockNumberFormatter(options.toBlock) 
-    }; 
+        toBlock: formatters.inputBlockNumberFormatter(options.toBlock)
+    };
 };
 
 /**
@@ -78,7 +78,7 @@ Adds the callback and sets up the methods, to iterate over the results.
 
 @method getLogsAtStart
 @param {Object} self
-@param {funciton} 
+@param {funciton}
 */
 var getLogsAtStart = function(self, callback){
     // call getFilterLogs for the first watch callback start
@@ -168,7 +168,7 @@ var Filter = function (requestManager, options, methods, formatter, callback) {
                 pollFilter(self);
 
             // start to watch immediately
-            if(callback) {
+            if(typeof callback === 'function') {
                 return self.watch(callback);
             }
         }